dictyonine (dic'-ty-o-nine''). adj. Said of a hexactinellid sponge whose parenchymalia (spicules) form a rigid framework composed of dictyonal strands; more loosely, said of a sponge whose skeleton is composed of subparallel hexactines rigidly fused so that the limits of individual spicules are not apparent. Ant: lyssacine. n. A dictyonine sponge.