halichondroid,a.Zool.|hælɪˈkɒndrɔɪd| [f.mod.L. Halichondria, name of a genus of sponges (f.Gr. ἅλς, ἁλι- sea + χόνδρος cartilage) + -oid.] Related to a group of sponges including Halichondria palmata, the largest British sponge. 1887Sollas in Encycl.Brit. XXII. 427/2 A very common Halichondroid sponge.