aspirator

tube being attached to one end, the other being thrust into the cavity, cat'aract n., a form of n. or very slender knife used in the removal or the disci ion of a cataract, explor'ing n., a stout n. with a longitudinal groove, which is thrust into a tumor or cavity in order to determine whether or not fluid is present, the latter escaping externally along the groove, hypoder'mic n., a hollow n. similar to, but smaller than, an aspirating n., attached to a syringe; used for injecting liquids beneath the skin or for withdrawing fluid for examination from an absce or cyst.