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Douglas Harper's Etymology Dictionary
allotrope

1847, back-formation from allotropy "variation of physical properties without change of substance," from allo- + -tropy "manner" (see -trope). Related: Allotropic.

Wiktionary
allotrope

n. (context chemistry English) Any form of an element that has a distinctly different molecular structure to another form of the same element.

WordNet
allotrope

n. a structurally different form of an element; "graphite and diamond are allotropes of carbon"

Usage examples of "allotrope".

He wanted to implode his features, to crush air from his mouth, in a way and to a degree that might be set against the mess of feelings she aroused in him: indignation, grief, resentment, peevishness, spite, and sterile anger, all the allotropes of pain.

To the average Qeng Ho, diamond was simply another allotrope of carbon, cheaply made in tonne lots.

After passing through the catalytic reactors, the rare hydrogen allotrope was siphoned off, while the waste gases spilled back out from the hot stacks.

Is there any other element that has an allotrope as unusual as diamond?

Khasr ship revealed that its whole substance was a highly unstable allotrope, which, however, was not radioactive.

Railgun launchers shot barrels of pure hydrogen ice up to a drifting ekti reactor that would catalyze the hydrogen into ekti, the valuable allotrope used as stardrive fuel.

Through catalysts and convoluted magnetic fields, the reactors converted ultrapure hydrogen into an exotic allotrope of hydrogen.

Ekti was the only known allotrope of hydrogen, though other elements had varying molecular forms.

The scoops and reactors had operated continuously for dozens of centuries, producing the hydrogen allotrope, though in recent years, it was only a token amount.

Its industrial systems were outdated and inefficient by now, but processing of the hydrogen allotrope continued.

The slow facilities would have to remain on-station at the gas giant for weeks before they produced enough of the rare allotrope to make a worthwhile cargo.

The covers blared three allotropes of mindless generic blonde, in shock and undress.

He finally found a way of imparting silver's selective absorption to a synthium allotrope, the clear, transparent type.