Word Study
halichondriæ
CIDE DICTIONARY
halichondriæ, n. pl. [NL., fr. Gr. "a`ls, "alo`s, sea + cho`ndros cartilage.].
An order of sponges, having simple siliceous spicules and keratose fibers; -- called also Keratosilicoidea . [1913 Webster]
For further exploring for "halichondriæ" in Webster Dictionary Online