Plural of faveolus; small honeycomb-like pits, depressions, or cellular structures.
From Latin faveolus (singular), a diminutive of favus, with the regular Latin plural -i. This is the standard plural form used in scientific terminology when describing collections of small honeycomb-like features.
In scientific Latin, the plural -i ending often marks masculine nouns—so one faveolus becomes many faveoli, just like one radius becomes many radii. This Latin grammar is still buried in scientific terminology worldwide.
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