Shaped like a key or having a key-like form, often used in biology to describe anatomical features.
From Greek kleís (key) + -oid (resembling). The term combines the Greek word for 'key' with the suffix meaning 'like' or 'resembling,' creating a descriptive anatomical term used in scientific nomenclature.
Nature loves keys—not just metaphorically, but literally! Many biological structures are cleoid because they evolved to fit perfectly into specific spaces, like an actual key in a lock, showing how evolution designs precision.
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