carboxyl Meaning, Definition & Usage

  1. noun the univalent radical -COOH; present in and characteristic of organic acids
    carboxyl group.
  2. adjective relating to or containing the carboxyl group or carboxyl radical
    carboxylic.

WordNet

Car*box"yl noun
Etymology
Carbon + oxygen + -yl.
Definitions
  1. (Chem.) The complex radical, CO.OH, regarded as the essential and characteristic constituent which all oxygen acids of carbon (as formic, acetic, benzoic acids, etc.) have in common; -- called also oxatyl.

Webster 1913