13-letter words containing x, e, n, a
- unexplanatory — serving to explain: an explanatory footnote.
- unextractable — to get, pull, or draw out, usually with special effort, skill, or force: to extract a tooth.
- unix man page — Unix manual page
- uranium oxide — any of the compounds of uranium and oxygen, as UO 2 , UO 3 , U 4 O 9 , or U 3 O 8 .
- xenodiagnosis — a method of diagnosing certain diseases caused by insects, ticks, or other vectors, by allowing uninfected vectors to feed on the patient and later examining them for infections.
- zooxanthellae — any of various symbiotic yellow-green or yellow–brown algae in the cytoplasm of certain radiolarians and marine invertebrates.