A small rounded vessel or cavity, especially in botanical or biological structures.
Diminutive form from Latin 'bullula,' meaning small blister or bubble. This botanical/biological term maintains Latin structure, appearing in scientific terminology for cellular or tissue structures. It's related to 'bullate' (having bubble-like protrusions).
Scientific Latin diminutives are like Russian nesting dolls of meaning—'bulla' (blister) becomes 'bullule' (tiny blister). Botanists use it to describe textured plant surfaces with countless little pockets.
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