Source : Webster's Revised Unabridged Dictionary (1913)

Halichondriae \Hal`i*chon"dri*[ae]\, n. pl. [NL., fr. Gr. ?, ?,
   sea + ? cartilage.] (Zo["o]l.)
   An order of sponges, having simple siliceous spicules and
   keratose fibers; -- called also {Keratosilicoidea}.