Note: Latin cavea is usually taken to be a noun derivative of an unattested adjective *caveus, from cavus "hollow, concave" (see cave entry 1, hole entry 1), the sense "something hollow, cavity" being extended to "enclosed space" and then "enclosure"; however, -eus is normally a denominal suffix meaning "made of" (see -eous), so that the resulting sense of the derivative is not clear. Perhaps of relevance is the suffix of alveus "trough, hull, channel" (see alveolus).