inhalation anesthesia by vaporization of a liquid anesthetic placed drop by drop on a gauze mask covering the mouth and nose.
o·pen drop an·es·the·si·a
(ō'pĕn drop an'es-thē'zē-ă) Inhalation anesthesia achieved by vaporization of a liquid anesthetic placed drop by drop on a gauze mask covering the mouth and nose.