outgrowth - a natural prolongation or projection from a part of an organism either animal or plant; "a bony process"horn - one of the bony outgrowths on the heads of certain ungulates horn - any outgrowth from the head of an organism that resembles a horn crest - a showy growth of e.g. feathers or skin on the head of a bird or other animal pseudopod, pseudopodium - temporary outgrowth used by some microorganisms as an organ of feeding or locomotion flagellum - a lash-like appendage used for locomotion (e.g., in sperm cells and some bacteria and protozoa) hair - a filamentous projection or process on an organism cirrus - a slender flexible animal appendage as on barnacles or crinoids or many insects; often tactile spine - a sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin aculea - small spiny outgrowth on the wings of certain insects style - a slender bristlelike or tubular process; "a cartilaginous style" villus - a minute hairlike projection on mucous membrane tail - the posterior part of the body of a vertebrate especially when elongated and extending beyond the trunk or main part of the body fetlock - projection behind and above a horse's hoof tentacle - any of various elongated tactile or prehensile flexible organs that occur on the head or near the mouth in many animals used for feeling or grasping or locomotion arista - bristlelike process near the tip of the antenna of certain flies body part - any part of an organism such as an organ or extremity ala - a flat wing-shaped process or winglike part of an organism; "the alae of the nose"; "the alae of a maple seed"; "the flat petals of a pea blossom are alae" alveolar arch - the part of the upper or lower jawbones in which the teeth are set acrosome - a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg caruncle, caruncula - an outgrowth on a plant or animal such as a fowl's wattle or a protuberance near the hilum of certain seeds condyle - a round bump on a bone where it forms a joint with another bone epicondyle - a projection on a bone above a condyle serving for the attachment of muscles and ligaments fimbria - thin projections forming a fringe (especially around the ovarian end of the Fallopian tube) apophysis - (anatomy) a natural outgrowth or projection on an organ or part such as the process of a vertebra spicule, spiculum - small pointed structure serving as a skeletal element in various marine and freshwater invertebrates e.g. sponges and corals papilla - a small projection of tissue at the base of a hair or tooth or feather papilla - a small nipple-shaped protuberance concerned with taste, touch, or smell; "the papillae of the tongue" zygomatic process - a slender process of the temporal bone that strengthens the zygomatic arch trochanter - one of the bony prominences developed near the upper extremity of the femur to which muscles are attached transverse process - one of two processes that extend from each vertebra and provide the point of articulation for the ribs metaphysis - the growing part of a long bone between the diaphysis and the epiphysis |