Resembling or having the characteristics of twin structures or didymium; shaped like or relating to twinned or paired elements.
From 'didym-' (twin, from Greek 'didymos') plus '-oid' (resembling or of the form of), a common suffix creating adjectives describing similarity.
The '-oid' suffix is a scientist's way of saying 'looks like but isn't exactly'—like 'humanoid' means alien-shaped, 'didymoid' means something appears twinned or dual without being truly paired, a useful distinction in mineralogy.
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