Hebrew measure of capacity (a little over 5 pints), 1610s, from Hebrew 'omer.
type of barbiturate, originally used to calm patients before anesthesia and operation, 1930, proprietary name of pentobarbitone sodium, formed from letters and syllables from N(a) "sodium" + full chemical name 5-ethyl-5-1-methylbutyl barbiturate.
c. 1600, "impulsive, propulsive," from past-participle stem of Latin pellere "to drive, strike" (from PIE root *pel- (5) "to thrust, strike, drive"). By 1960 as "making a beating or throbbing sound." Related: Pulsively; pulsiveness.