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Definition of 'tongue depressor'. tongue depressor (tÊÅ dÉªprÉsÉr ) Word forms: tongue depressors. countable noun. A tongue depressor is a medical instrument that is used to press a patient's tongue down so that their mouth or throat can be examined more easily. [medicine] Dr. Avery took the tongue depressor out of Rae's mouth.
Anatomy. 1  a muscle that draws down a part of the body, as the corner of the mouth. Compare levator. 2  Also called depressor nerve. a nerve that, when stimulated, induces a decrease in activity, as a slowed heartbeat.