Entry 1 sense Webster, 1913 Carbolic acid /(kär*bŏl"ĭk ăs"ĭd)/ · Car·bol·ic ac·id · IPA 01 n. same as phenol{1}, (C6H5.OH). See phenol{1}. 1. same as phenol{1}, (C6H5.OH). See phenol{1}.(Chem.) See: phenol{1}, phenol{1} Syn. phenol{1}, hydroxybenzene, phenyl hydroxide, phenic acid.