Ventriculi

Part of speech: noun

Definitions

1. A term referring to the cavities within the brain or heart that contain fluids and play a critical role in bodily functions
2. This relates to the chambers in the heart responsible for pumping blood or the hollow spaces in the brain filled with cerebrospinal fluid
3. Indicating the anatomical spaces that are essential for circulation and communication of fluids within the central nervous system and cardiovascular system

Etymology: "Ventriculi" is the Latin plural of "ventriculus," so English took it whole, without adapting it to English spelling or endings. The singular is a diminutive of "venter," the Latin word for belly, which makes a "ventriculus" literally a little belly or small stomach-like cavity. That is the same idea that later gave English the anatomical term "ventricle," which the word is a doublet of: two forms of one Latin source that reached English by different routes. The sense of a hollow cavity is what carried the word into anatomy. Because the heart and brain each contain chambers that hold fluid or blood, Latin writers and later anatomists applied the belly-diminutive to these internal spaces. The plural form keeps the Latin ending, which is why specialists use "ventriculi" when they discuss more than one of these chambers, while everyday English usually relies on the adapted "ventricles."