PERVALVAR

\pəvˈalvɑː], \pəvˈalvɑː], \p_ə_v_ˈa_l_v_ɑː]\
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1920 - A dictionary of scientific terms.
By Henderson, I. F.; Henderson, W. D.
 
1920 - A dictionary of scientific terms (6th edition)
By J.H. Kenneth