Com·bine, v. i.
 1. To form a union; to agree; to coalesce; to confederate.
 You with your foes combine,
 And seem your own destruction to design   --Dryden.
    So sweet did harp and voice combine.   --Sir W. Scott.
 2. To unite by affinity or natural attraction; as, two substances, which will not combine of themselves, may be made to combine by the intervention of a third.
 3. Card Playing In the game of casino, to play a card which will take two or more cards whose aggregate number of pips equals those of the card played.
 Combining weight Chem., that proportional weight, usually referred to hydrogen as a standard, and for each element fixed and exact, by which an element unites with another to form a distinct compound. The combining weights either are identical with, or are multiples or submultiples of, the atomic weight. See Atomic weight, under Atomic, a.

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 combining weight
      n : the atomic weight of an element that has the same combining
          capacity as a given weight of another element; the
          standard is 8 for oxygen [syn: equivalent, {equivalent
          weight, eq]