opaque
(of an object) blocking the passage of light and preventing objects from being seen through it

матовый, непрозрачный
[прилагательное]
opalescence
the visual property of something having a milky brightness and a play of colors from the surface

опалесценция
[существительное]
cogent
(of cases, statements, etc.) capable of making others believe that something is true with the use of logic and reasoning

убедительный
[прилагательное]
parentage
the kinship relation of an offspring to the parents

происхождение, родословная
[существительное]
preface
an introductory piece written by the author of a book explaining its subject, scope, or aims

предисловие
[существительное]
prefatory
put or said at the beginning of a book, speech, or other work as an introduction or explanation

вступительный
[прилагательное]

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