oxea

Etymology
From. Either from the form of , (a feminine form of  applied to ) or a variant of ,.

Noun

 * 1)  a monoaxial spicule which is pointed at both ends

Usage notes

 * The Oxford English Dictionary lists only the plural oxea, but other sources list the plurals oxeae (by analogy to Latin feminine nouns such as ~ ) or oxeas (by generalization to standard English pluralization).