noun (plural -pies) Date: 1850 the existence of a substance and especially an element in two or more different forms (as of crystals) usually in the same phase, allotropic adjective
ALLOTROPY
Meaning of ALLOTROPY in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012