Definition of mouthguard in English:

mouthguard

Syllabification: mouth·guard
Pronunciation: /ˈmouTHɡärd/

Entry from US English dictionary

noun

A plastic shield held in the mouth by an athlete to protect the teeth and gums.

Definition of mouthguard in:

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Pronunciation: ˌmɛrɪˈtrɪʃəs
adjective
apparently attractive but having no real value...