The Collaborative International Dictionary of English v.0.48:
molal \molal\ adj. (Chem.) Being at a concentration with the designated number of moles (of solute) per 1000 grams of solvent; as, an 0.5 molal solution of glycerol in water. Compare molar. [WordNet 1.5]WordNet (r) 3.0 (2006):
molal adj 1: designating a solution containing one mole of solute per kilogram of solvent