WordWeb Online

1. Consisting of or involving two parts or components usually in pairs
   "dual controls for pilot and copilot";
   - double, duple
    
2. Having more than one decidedly dissimilar aspects or qualities
   "a dual role for an actor";
   - double, twofold, two-fold, treble, threefold, three-fold, trifold
    
3. A grammatical number category referring to two items or units as opposed to one item (singular) or more than two items (plural)
   "ancient Greek had the dual form but it has merged with the plural form in modern Greek"

1. Of an item that is one of a pair, the other item in the pair

Sounds like: droops, drupesl, due

Derived forms: duals

See also: multiple, plural

Encyclopedia: Dual