labializeEnglishOxford Dictionary of Englishlabialize /ˈleɪbiəlʌɪz / (British English also labialise) ▸ verb [with object] Phonetics pronounce (a consonant) with partial or complete closure of the lips, or (a vowel) with rounded lips: a non-standard dialect that labializes the /r/ and /l/ sounds (labialized as adjective) a voiceless labialized uvular fricative.