ALLOTROPISM

allotropy, allotropism

(noun) the phenomenon of an element existing in two or more physical forms

Source: WordNet® 3.1


Etymology

Noun

allotropism (plural allotropisms)

(chemistry) The ability (of an element) to exist in more than one physical form without change of state.

Synonyms

• allotropy

Source: Wiktionary


Al*lot"ro*pism, Al*lot"ro*py, n. Etym: [Gr. allotropie.] (Chem.)

Definition: The property of existing in two or more conditions which are distinct in their physical or chemical relations.

Note: Thus, carbon occurs crystallized in octahedrons and other related forms, in a state of extreme hardness, in the diamond; it occurs in hexagonal forms, and of little hardness, in black lead; and again occurs in a third form, with entire softness, in lampblack and charcoal. In some cases, one of these is peculiarly an active state, and the other a passive one. Thus, ozone is an active state of oxygen, and is distinct from ordinary oxygen, which is the element in its passive state.

Source: Webster’s Unabridged Dictionary 1913 Edition



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Word of the Day

3 July 2025

SENSE

(noun) the faculty through which the external world is apprehended; “in the dark he had to depend on touch and on his senses of smell and hearing”


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Coffee Trivia

In 1511, leaders in Mecca believed coffee stimulated radical thinking and outlawed the drink. In 1524, the leaders overturned that order, and people could drink coffee again.

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