• WordNet 3.6
    • adj molal designating a solution containing one mole of solute per kilogram of solvent
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Century Dictionary and Cyclopedia
    • molal Of, or pertaining to, that amount of an element or compound which is equal to its molecular weight taken in grams. This amount is sometimes called a mol, and from the term in the German language an adjective molar is derived. The use of this German form of the adjective in English is infelicitous, since the English word ‘molar’ has already a very different meaning. Accordingly, some have lately used the adjective molal.
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In literature:

Cecil noticed in particular Mishlah the Cougar, chief of the Molallies.
"The Bridge of the Gods" by Frederic Homer Balch