allotrope

The story

1. Ancient Greek · derived fromἄλλος“other”
2. English todayallotrope

Back-formation from allotropy, as allo- + -trope, from Ancient Greek ἄλλος (állos, “other”), and τρόπος (trópos, “way, manner”).

Words from the same roots

First known use, by meaning

• from 1847 Any form of an element that has a distinctly different molecular structure to another form of the same element, with different physical properties and often different chemical properties.