external
111external exocuticle — (NEMATA) In derived forms, a subdivison of the exocuticle …
112external genitalia — The organs involved with sexual mating and the deposition of eggs …
113external medullary mass — see medulla …
114external muscle — (BRYOZOA) A muscle extending from a body wall across the body cavity, to the lophophore or to the gut …
115external parasite — An ectoparasite …
116external respiration — The process of gaseous exchange between an organism and its environment …
117external secretion — Any secretion to the outside of the body or into the cavity of the enteron …
118external statocysts — (ARTHROPODA: Insecta) Special hair structures for the retention of the air supply that are adapted to underwater life …
119external thickening — see buttress …
120external-combustionengine — ex·ter·nal com·bus·tion engine (ĭk stûrʹnəl kəm bŭsʹchən) n. An engine, such as a steam engine, in which the fuel is burned outside the engine cylinder. * * * …