EM イー・エム Meanings Noun effective microorganisms See also: 有用微生物群 (ゆうようびせいぶつぐん). Words containing EM EMS (イー・エム・エス) Express Mail Service EMC (イー・エム・シー) electromagnetic compatibility OEM (オー・イー・エム) original equipment manufacturer And 3 more. Jinuma: Japanese Dictionary · Word lists