Allotrope vs. Allotroph: What's the Difference?

Allotrope and Allotroph Definitions
Allotrope
A structurally differentiated form of an element that exhibits allotropy.
Allotroph
(rare) heterotroph
Allotrope
(chemistry) Any form of an element that has a distinctly different molecular structure to another form of the same element.
Ozone (O3) is an allotrope of oxygen, normally O2
Allotrope
(linguistics) An other form, a different shape of a lexical unit.
Allotrope
(philosophy) An alternative shape of a cognitive structure.
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Allotrope
A structurally different form of an element;
Graphite and diamond are allotropes of carbon