Shaped like a spur or having a spur-like projection, especially in plants and animals.
From Latin 'calcar' (spur) + '-form' (shaped like). The word evolved from the physical resemblance of certain biological structures to the spurs worn on a rider's heel.
Many flowers like orchids and violets have calcariform petals that act like tiny tubes to guide insects toward nectar—it's nature's way of creating a VIP lane for pollinators!
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