INVOLUNTARY MUSCLE

\ɪnvˈɒləntəɹi mˈʌsə͡l], \ɪnvˈɒləntəɹi mˈʌsə‍l], \ɪ_n_v_ˈɒ_l_ə_n_t_ə_ɹ_i m_ˈʌ_s_əl]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
2010 - Medical Dictionary Database
By DataStellar Co., Ltd
 
1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop