From Wikipedia, the free encyclopedia. Acetic anhydride, or ethanoic anhydride, is the chemical compound with the formula (CH 3 CO) 2 O. Commonly abbreviated Ac 2 O, it is the simplest isolable anhydride of a carboxylic acid and is widely used as a reagent in organic synthesis.o a decreasing extent, acetic anhydride is also prepared by the reaction of ketene (ethenone) with acetic acid at 45â55 Â°C and low pressure (0.05â0.2 bar).
Definition: The prefix (eu-) means good, well, pleasant or true. It is derived from the Greek eu meaning well and eus meaning good. Eubacteria (eu-bacteria) - kingdom in the bacteria domain. Bacteria are considered to be true bacteria, distinguishing them from archaebacteria.
Save. euphemism /ËjuËfÉËmÉªzÉm/ noun. plural euphemisms. euphemism. /ËjuËfÉËmÉªzÉm/. noun. plural euphemisms. Learner's definition of EUPHEMISM. [count]. : a mild or pleasant word or phrase that is used instead of one that is unpleasant or offensive. using âeliminateâ as a euphemism for âkillâ. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples. /ËjuËfÉËmÉªstÉªk/ adjective [more euphemistic; most euphemistic].