insaˈccationPhysiol.rare—0. [noun of action from med.L. insaccāre to put into a sack or bag, f.in- (in-2) + saccus bag, sack.] 1855Mayne Expos.Lex., Insaccatio,..the covering or surrounding of the organs with membranes, as the womb, urinary bladder, etc.: insaccation.1886in Syd. Soc.Lex.