The Collaborative International Dictionary of English v.0.48:

Chrysophyta \Chrysophyta\ n.
   a division of mostly freshwater eukaryotic algae having the
   chlorophyll masked by brown or yellow pigment; yellow-green
   and golden-brown algae and diatoms, including the
   Xanthophyceae, Chrysophyceae, Bacillariophyceae; some some
   classification systems superseded or subsumed by
   Heterokontophyta.

   Syn: division Chrysophyta.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Chrysophyta
    n 1: mostly freshwater eukaryotic algae having the chlorophyll
         masked by brown or yellow pigment; yellow-green and golden-
         brown algae and diatoms: Xanthophyceae, Chrysophyceae,
         Bacillariophyceae; some classification systems superseded
         or subsumed by Heterokontophyta [syn: Chrysophyta,
         division Chrysophyta]