Plural of calcar; anatomical projections or spur-like structures found in organisms, particularly referring to heel-like protrusions in certain plants and animals.
From Latin 'calcar' meaning spur or heel, derived from 'calx' (heel, limestone). The plural form maintains the Latin nominative structure commonly used in anatomical terminology.
Calcars appear in orchids as tiny spur-like tubes that hold nectar—it's nature's way of guiding insects to exactly the right spot for pollination, like an anatomical arrow pointing 'pollinate here!'
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