Как по Английски будет allotroop

noun

Each of two or more different physical forms in which an element can exist. graphite, charcoal, and diamond are all allotropes of carbon.

Примеры использования:

Two allotropes of the element exist, accounting for the slight variation in densities.

adjective

Used to describe different physical forms of the same chemical substance

Примеры использования:

Diamond and graphite are allotropic forms of carbon., an allotropic modification