caustic alcohol

from The Century Dictionary.

• etc. See the nouns.
• noun In medicine, any substance which burns, corrodes, or disorganizes the tissues of animal structures; an escharotic.
• noun Figuratively, something pungent or severely critical or sarcastic. See causticity.
• noun In mathematics, an envelop of rays of light proceeding from a fixed point and reflected or refracted by a surface or a curve.