One of the mysteries of the English language finally explained.
Designating a cusp at which the two branches of the curve lie on the same side of the common tangent, i.e. they have their concavity in the same direction. Contrasted with "keratoid".
Early 19th century (in an earlier sense). From ancient Greek ῥάμϕος beak, of uncertain origin + -oid, after French ramphoïde, noun.
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