A small berry or rod-shaped botanical structure; a diminutive form used in classical botanical description.
From Latin baccillum, a diminutive of bacca (berry); the -um ending indicates a Latin neuter noun, common in scientific nomenclature.
Latin endings like -um, -a, and -us still dominate scientific names because they're part of an international language that scientists worldwide can understand—like a secret code that works everywhere.
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