The Collaborative International Dictionary of English v.0.48:

Galingale \Gal"in*gale\, n. [See Galangal.] (Bot.)
   A plant of the Sedge family (Cyperus longus) having
   aromatic roots; also, any plant of the same genus. --Chaucer.
   [1913 Webster]

         Meadow, set with slender galingale.      --Tennyson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Cyperus longus
    n 1: European sedge having rough-edged leaves and spikelets of
         reddish flowers and aromatic roots [syn: galingale,
         galangal, Cyperus longus]