Entry 2 senses · 2 variants Webster, 1913 Teeth /tēth/ · IPA /ˈtiθ/ n. v. i. 01 n. pl. of Tooth. 1. pl. of Tooth. See: Tooth 02 v. i. To breed, or grow, teeth. imp. & p. p. Teethed; p. pr. & vb. n. Teething 1. To breed, or grow, teeth.