Home › Words › M › mouthguardmouthguardmouthguard · noun — A device that fits into the mouth over one or both arches of the teeth and usually made of plastic. Such devices may protect against injury during sport or fighting or may serve a medical purpose.Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom mouth + guard.nounA device that fits into the mouth over one or both arches of the teeth and usually made of plastic. Such devices may protect against injury during sport or fighting or may serve a medical purpose.Definitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.faceguard 60% match — A protective guard for the face. vs mouthguard →armguard 56% match — A protective cover for the arm. vs mouthguard →chestguard 55% match — A piece of fabric, padding, or armor to protect the chest, as in some sports. vs mouthguard →mouthie 53% match — The mouth. vs mouthguard →bowguard 52% match — A protective cover worn on the wrist or forearm, sometimes extending to partially cover the hand, which provides protection from the snap of a released bowstring. vs mouthguard →mouthbrush 52% match — A toothbrush for cleaning the teeth and gums. vs mouthguard →biteplate 51% match — An appliance, that incorporates a sheet of acrylic designed to occlude with the opposing teeth, used as a diagnostic tool vs mouthguard →underguard 48% match — A protective guard on the underside of machinery, for example on a vehicle's exhaust. vs mouthguard →