A small notch, ridge, or tooth-like projection, especially on the edge of a leaf or shell; a scalloped indentation.
From Latin crena, meaning notch or indentation. Used in biology and botany to describe small regular projections or indentations, borrowed directly from classical Latin terminology.
In botany, crena lets scientists precisely describe leaf edges without ambiguity—a 'crenate' leaf looks completely different from a 'serrate' one, and these distinctions are crucial for plant identification!
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