a small gland or gland-like structure in a plant or animal.
From Latin 'glandula,' a diminutive of 'glans' (acorn, gland), because glands were thought to resemble acorns. The '-ule' suffix indicates something small.
Botanists and biologists use 'glandule' for tiny glands you'd need a microscope to see, and it's one of the few remaining uses of the Latin diminutive '-ule' in English scientific terminology!
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