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Irregular Words - Multiple Plural Forms

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Categorized English Irregular Words
antenna
[noun]

(zoology) any of the pair of sensory appendages on the head of an insect, crustacean or arthropod

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apex
[noun]

the topmost point of something

Ex: The statue was placed at the apex of the hill , overlooking the surrounding valley .
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appendix
[noun]

a sack of tissue that is attached to the large intestine and is surgically removed if infected

Ex: Appendicitis is inflammation of the appendix and requires surgical removal .
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beau
[noun]

a man romantically involved with someone

Ex: Julia introduced her beau to her parents at the family dinner .
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bureau
[noun]

a desk with drawers and a writing surface on top that opens downwards

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cactus
[noun]

a desert plant with a lot of spines on a thick stem that stores water

Ex: The cactus is well adapted to survive in the desert because it stores water in its thick stem .
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buffalo
[noun]

a large animal like a cow with dark fur that is found in America

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the overall content, courses, and learning experiences designed by educational institutions to achieve specific educational goals and outcomes for students

Ex: The online platform provides access to resources and materials aligned with the curriculum for distance learning .
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dwarf
[noun]

a fictional, small human-like creature that generally lives under the ground and works in mines

Ex: Snow White sought refuge with the seven dwarfs in the forest after escaping the evil queen .
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formula
[noun]

(mathematics) a rule or law represented in symbols, letters, or numbers

Ex: Physicians apply medical formulas to determine appropriate dosages of medications based on patient weight and condition .
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fungus
[noun]

a plant-like organism that often grows on organic matter and has no flowers or leaves, such as moulds and mushrooms

Ex: Penicillin , a groundbreaking antibiotic , is derived from a type of fungus.
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genus
[noun]

(biology) any of the groups that plants, animals, etc. with similar characteristics are divided into, which is larger than a species and smaller than a family

Ex: Scientists debated whether the newly found fossil should be classified within the existing genus or if it represented a new genus entirely .
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hoof
[noun]

the horny and hard part at the end of a limb of a mammal, such as a horse

Ex: The pony 's hooves were shiny after being polished .
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index
[noun]

a system that provides the amount of prices, costs, etc. so that one can compare them with their previous value

Ex: The company 's performance index showed steady growth in sales and profitability over the last quarter .
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matrix
[noun]

a rectangular array of numbers or symbols organized in rows and columns, commonly used in linear algebra for representing equations, transformations, and vector operations

Ex: Matrix addition and subtraction are performed element-wise , combining corresponding elements of two matrices.
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medium
[noun]

a means that is used for the purpose of communicating or expressing something

Ex: Painting is the medium she uses to express her creative ideas .
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a written message or communication, often used within an organization, to convey information, directives, or agreements to employees or stakeholders in a concise and formal manner

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Nebula
[noun]

a glowing cloud of gas and dust in outer space, often the result of a star explosion or formation

Ex: The beautiful colors of the Eagle Nebula were captured by the space telescope.
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opus
[noun]

a musical piece or collection that is written by a famous composer followed by the date in which it was created

Ex: Beethoven's "Opus 28," the "Piano Sonata No. 7," showcases his early compositional style from 1800.
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plateau
[noun]

an area of land that is flat and higher than the land surrounding it

Ex: The Qinghai-Tibet Plateau , often called the " Roof of the World , " is the highest and largest plateau in the world .
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radius
[noun]

the length of a straight line drawn from the center of a circle to any point on its outer boundary

Ex: The radius of a planet determines its gravitational influence and orbital characteristics within a solar system .
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the process by which all the people of a country have the opportunity to vote on a single political question

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scarf
[noun]

a piece of cloth, often worn around the neck or head, which can be shaped in a square, rectangular, or triangular form

Ex: The scarf she wore had a beautiful pattern that matched her dress .
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syllabus
[noun]

a document that outlines the topics, assignments, and expectations for a course

Ex: The syllabus for the Psychology class lists the textbooks , course objectives , and schedule of lectures and exams .
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symposium
[noun]

a conference or meeting where experts discuss a particular topic or set of topics

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vertex
[noun]

the highest point or peak of something

Ex: The artist meticulously painted the vertex of the canvas , capturing the intricate details of the scene 's focal point .
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vortex
[noun]

a swirling mass of fluid with a rotating motion, often forming a funnel shape

Ex: A powerful vortex formed in the river , creating a challenge for kayakers navigating the turbulent waters .
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wharf
[noun]

a structure built along the water's edge; often with a platform for ships to load and unload goods

Ex: Construction of a new wharf improved the port 's shipping efficiency .
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a large African mammal with a thick gray skin, big jaws and tusks that lives near water

Ex: The zoo has a large hippopotamus in the river enclosure .
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aquarium
[noun]

a large container usually made of glass that is filled with water in which fish and other sea creatures are kept

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codex
[noun]

an ancient book, written by hand, especially of scriptures, classics, etc.

Ex: The monastery 's library houses a remarkable collection of codices, each one meticulously copied and illustrated by hand by dedicated scribes .
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Irregular Words
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