SIGMOIDAL

\sˈɪɡmɔ͡ɪdə͡l], \sˈɪɡmɔ‍ɪdə‍l], \s_ˈɪ_ɡ_m_ɔɪ_d_əl]\
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1898 - Warner's pocket medical dictionary of today.
By William R. Warner