The Collaborative International Dictionary of English v.0.48:

Cumin \Cum"in\ (k?m"?n), n. [OE.comin, AS. cymen, fr. L.
   cuminum, Gr. ???????; of Semitic origin, cf. Ar. kamm?n, Heb.
   kamm?n; cf. OF. comin, F. cumin. Cf. Kummel.] (Bot.)
   A dwarf umbelliferous plant, somewhat resembling fennel
   (Cuminum Cyminum), cultivated for its seeds, which have a
   bitterish, warm taste, with an aromatic flavor, and are used
   like those of anise and caraway. [Written also cummin.]
   [1913 Webster]

         Rank-smelling rue, and cumin good for eyes. --Spenser.
   [1913 Webster]

   Black cumin (Bot.), a plant (Nigella sativa) with pungent
      seeds, used by the Afghans, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

cumin
    n 1: dwarf Mediterranean annual long cultivated for its aromatic
         seeds [syn: cumin, Cuminum cyminum]
    2: aromatic seeds of the cumin herb of the carrot family [syn:
       cumin, cumin seed]