One of the mysteries of the English language finally explained.
1Anatomy and Zoology. A small depression or cavity, especially on the surface of a structure; a small fossa.
2Zoology and Botany. A shallow groove, especially in the cuticle of an insect or the surface of a pollen grain or spore.
3Palaeontology. In rugose corals: a cavity or groove where one of the primitive septa has failed to develop.
Mid 18th century. From classical Latin fossula small trench from fossa + -ula, originally after French fossette.
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