Having the exact shape and appearance of a crescent moon; crescent-shaped.
From crescent plus Latin 'forma' meaning form or shape, plus '-iform' meaning having the form of. This Latinate construction is common in scientific nomenclature.
In anatomy, crescentiform describes the menisci in your knees—C-shaped cartilage pads that act like shock absorbers, and their shape is literally built into their Latin name!
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