v. intr. and trans. To ossify together; to unite into one bone.
1877. Coues, Fur Anim., vii. 203. All the bones of the skull finally coossify, excepting, of course, the mandible.
1882. O. C. Marsh, in Pop. Sc. Monthly, XX. 314. The fibula may be co-ossified with the side of the tibia.
Hence Co-ossification, union (of two or more bones) into one bone.
1885. C. A. Buckmaster, in Brit. Almanac & Comp., 193. The co-ossification of the pelvic bones is peculiar.