A small hood or cowl-like structure; a botanical term for a hood-shaped covering or appendage on a plant.
From Latin 'cucula' or 'cuculla' (hood, cowl), diminished by the suffix '-ule' (small); refers to small hooded structures in nature.
Plant scientists borrowed the word 'cucule' from the fashion and religious world because some plants literally wear tiny hoods—nature has been 'hooding' structures millions of years before humans invented the hoodie!
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