trichloroacetic acidPronunciation: /trʌɪˌklɔːrəʊəˈsiːtɪk, -ˌklɒrəʊ-/ (also trichloracetic acid /-ˌklɔːrəˈsiːtɪk, -ˌklɒr-/)Definition of trichloroacetic acid noun [mass noun] Chemistry a toxic deliquescent crystalline solid used as a solvent, analgesic, and anaesthetic. Chemical formula: CCl3COOH trichloroacetic acid in other Oxford dictionaries Definition of trichloroacetic acid in the US English dictionary