Definition of mouth stick in English:

mouth stick

noun

  • 1An instrument used by a dentist, doctor, or other medical professional when examining a patient's mouth (now rare).

  • 2A stick which is designed to be manipulated by the mouth and used to carry out a particular task by a person with severely impaired movement in the hands and arms; (in later use also) a stick which controls a device which is designed for this purpose.

Origin

Early 20th century; earliest use found in Oral Hygiene.