gomphosis

‖n. [ NL., fr. Gr. &unr_;, prop., a bolting together, fr. &unr_; to fasten with bolts or nails, &unr_; bolt, nail: cf. F. gomphose. ] (Anat.) A form of union or immovable articulation where a hard part is received into the cavity of a bone, as the teeth into the jaws. [ 1913 Webster ]