- In zoology and botany, somewhat pileus; some little caplike or lid-like human anatomy; especially, the receptacle of particular fungi.
- [capitalized] A genus of gastropods of the household Neritidæ, belonging to the Oölite, having no spire, the shell resembling that of a limpet.
Sentence for "pileolus"
- "The zucchetto, or pileolus, is removed…
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