1A person who or thing which augments something; = "augmenter".
rare A nerve that stimulates the contraction of cardiac muscle or visceral smooth muscle. Compare sense B.
Especially of a nerve or other neural element: that increases the rate or strength of contraction in cardiac muscle or (in later use) visceral smooth muscle. Also: designating this action; of or relating to this action. Chiefly attributive.
Late 15th century; earliest use found in William Caxton (1415x24–1492), printer, merchant, and diplomat. From augment + -or, originally after Middle French augmenteur person who increases or enlarges something, augmentateur.