Basic Nouns - Shapes

Here you will learn some English nouns related to shapes such as "oval", "sphere", and "trapezoid".

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circle [noun]

a completely round, plain shape

Ex: The Earth is approximately a sphere , which is like a 3D circle .

square [noun]

a shape with four equal straight sides and four right angles, each measuring 90°

Ex:

triangle [noun]

(geometry) a flat shape consisting of three straight sides and three angles

Ex: The roof of the house formed a triangle at the top , providing stability .

rectangle [noun]

(geometry) a flat shape with four right angles, especially one with opposing sides that are equal and parallel to each other

Ex: She drew a rectangle on the paper to outline the garden plot .

oval [noun]

a shape that is wide in the middle and narrow at both ends

Ex: In geometry , an oval is often described as an ellipse with varying lengths .

diamond [noun]

a shape with four equal, sloping straight sides, forming a point at the top and another at the bottom

Ex: The kite flying in the sky had a beautiful diamond shape .

star [noun]

a shape with five or more points, representing a star in the sky

Ex: The children cut out stars from colored paper for the craft project .

sphere [noun]

(in geometry) a three-dimensional surface where all points are equidistant from a center

Ex: Spheres are often used in design for their smooth and harmonious appearance .

cube [noun]

a three-dimensional figure made of six square or rectangular faces

Ex: The classroom had storage bins shaped like colorful cubes for organizing supplies .

cylinder [noun]

(geometry) a solid or hollow shape with two circular bases at each end and straight parallel sides

Ex: The artist sculpted a beautiful marble cylinder as part of a modern art installation .

cone [noun]

(geometry) a three dimensional shape with a circular base that rises to a single point

Ex:

pyramid [noun]

a solid with a polygonal base and triangular faces that meet at a single point

Ex: They studied the properties of a pyramid in geometry class , focusing on its volume and surface area .

cuboid [noun]

a three-dimensional geometric shape with six rectangular faces, resembling a box or a rectangular prism

hemisphere [noun]

either half of a sphere

Ex: They used a metal hemisphere to cover the delicate machinery .

prism [noun]

(geometry) a solid figure with flat sides and two parallel ends of the same size and shape

parallelogram [noun]

(geometry) any flat shape with four straight sides, the opposite sides of which are equal and parallel to each other

trapezoid [noun]

(geometry) a flat shape with four flat sides, two of which are parallel

crescent [noun]

a curved shape with narrow points at the ends that appears wider in the middle, like the shape of the moon in its first and last quarters

Ex: She watched the crescent slowly grow each night as the moon waxed towards fullness .

cross [noun]

a mark or an object formed by two short lines or pieces crossing each other

Ex: The flag of Switzerland features a white cross on a red background .

spiral [noun]

(geometry) a curved shape or design that gradually winds around a center or axis

Ex: The tornado formed a destructive spiral as it swept across the plains , leaving devastation in its wake .

kite [noun]

a four-sided shape with two pairs of equal-length adjacent sides

right triangle [noun]

a flat geometric shape consisting of three straight sides and one right angle

lozenge [noun]

(geometry) a four-sided figure with opposite equal angles, forming a diamond shape

Ex: The heraldic shield displayed a golden lozenge .

spheroid [noun]

(geometry) a round 3D shape like a ball that is slightly flattened at the top and bottom points

Ex: The Earth is not quite a sphere but is better described as an oblate spheroid flattened at the poles .

semicircle [noun]

any half of a circle

Ex: He drew a semicircle on the board to explain the concept of angles .

pentagon [noun]

a geometric shape with five angles and five straight sides

Ex: The stop sign is shaped like a red pentagon to alert drivers to halt .

hexagon [noun]

(geometry) a closed shape with six straight sides and six angles

Ex: She decided to tile her bathroom floor with hexagon-shaped tiles.

heptagon [noun]

a seven-sided plane shape consisting of seven line segments or edges that meet at seven interior angles

Ex: One version of the game featured a board laid out in a grid of non-uniform heptagons instead of the usual squares .

octagon [noun]

(geometry) a polygon consisting of eight straight sides and eight angles

Ex: Each of the eight sides of the octagon was painted a different color .

nonagon [noun]

(geometry) a flat shape consisting of nine straight sides and nine angles

decagon [noun]

(geometry) a flat polygon with ten straight sides and ten angles

Ex: Architects sometimes incorporate shapes like the decagon into their designs for a unique appearance .

pentagram [noun]

a five-pointed star

Ex: She drew a pentagram on the front of her notebook .

hexagram [noun]

(geometry) a flat star-shaped figure with six points that can be formed by making equilateral triangles on each side of a regular hexagon

zigzag [noun]

(geometry) a shape that consists of a line alternating its direction to left and right

hendecagon [noun]

(geometry) a flat figure consisting of eleven straight sides and eleven angles

dodecagon [noun]

(geometry) a flat figure that consists of twelve sides and twelve angles

tridecagon [noun]

a polygon with thirteen sides and thirteen angles

oblong [noun]

a rectangular figure that has unequal adjacent sides with arched angles

Ex:

torus [noun]

a solid shape resembling a donut or ring, made by spinning a circle around a line that does not cut through the circle

Ex:

curve [noun]

a line or shape that is not straight and bends gradually

Ex: In math class , they studied the properties of different types of curves .

parallel [noun]

a pair of geometric figures, such as lines or planes, that do not meet or intersect, no matter how far they are extended

Ex: The parallel between the two roads is noticeable from above .

ellipse [noun]

(geometry) a closed plane curve that has two focal points

Basic Nouns
Animals	Birds and Insects	Fish	Food
Drinks	Fruits	Vegetables	Jobs
Face and Body	Furniture	Home Appliances	Kitchen Wares
Building Parts	Clothes	Sports	Nature
Transportation	City Locations	Hobbies and Games	Shapes
Feelings	Musical Instruments	Personal Care	Art