Resembling a gem or bud in form; having the appearance or characteristics of a gemstone or a budding structure.
From Latin gemma (bud, gem) + -oid (from Greek eidos meaning 'form' or 'appearance'). The -oid suffix is widely used in scientific terminology to indicate similarity without identity, as in humanoid or crystalloid.
The -oid suffix is fascinating because it lets scientists say 'looks like but isn't really'—so something gemmoid sparkles and looks precious but may be worthless, a distinction important for mineralogy and fraud prevention.
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