1921 H. F. Julian & E. Smart (ed. 3) xxxi. 239 From 20 to 30 tons of pregnant solution is run into the precipitation tank.
1959 J. Newton vii. 413 It is usually necessary to separate the pregnant solution from the leached residue (tailing) before the metal can be precipitated.
2002 (Nexis) 26 July 26 The ‘pregnant liquor’ containing the dissolved zinc metal is recovered as it drains from the pads.