noun 1. synthetic fuel. synfuels [(sin-fyooh-uhlz)] Short for synthetic fuels. Synfuels are substances made through the extraction of petroleum or coal from minerals found in the western United States. Note: The cost of synfuels is presently too high to make them commercially attractive.
noun, Biology. 1. union of gametes, as in fertilization or conjugation; sexual reproduction. noun 1. other names for sexual reproduction syngamy syn·ga·my (sĭng’gə-mē) n. The fusion of two gametes in fertilization. syn·gam’ic (sĭn-gām’ĭk) or syn’ga·mous (sĭng’gə-məs) adj. syngamy (sĭng’gə-mē) The fusion of two gametes in fertilization.
noun 1. synthetic natural gas. See under synthetic fuel.
syngeneic syn·ge·ne·ic (sĭn’jə-nē’ĭk) adj. Genetically identical or closely related, so as to allow tissue transplant; immunologically compatible.