UNDERJAW

\ˌʌndəd͡ʒˈɔː], \ˌʌndəd‍ʒˈɔː], \ˌʌ_n_d_ə_dʒ_ˈɔː]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.