Utriculus

Part of speech: noun

Pronunciation: /jʊˈtɹɪk.jəl.əs/

Definitions

1. A small sac within the vestibular system of the inner ear that helps sense gravity and motion ; a part of some insect larvae's digestive tract functioning as a storage or processing area for food
2. An inner ear cavity involved in balance and spatial orientation ; an organ in larval insects that acts as a holding chamber for ingested material
3. A chamber inside the ear's vestibular structure that contributes to balance sensing ; a digestive pouch found in the larvae of certain insects serving as a temporary food reservoir

Etymology: "Utriculus" is the Latin diminutive of "uter," meaning "leather bag" or "wineskin," so the word's core image is a small bag. The Latin form has been in use in English since the 1600s, when anatomists borrowed it directly rather than letting it pass through French. Its English twin, "utricle," arrived by a different route, which is why the two forms sit side by side as doublets. The ear meaning comes from the anatomical sense of a small sac, one of the fluid-filled chambers in the inner ear that register head position. The insect larva sense applies the same idea to a pouch that stores food. The word carries no trace of its ear or insect meanings in Latin itself; those are later specialised uses of the original bag image.