Wordnet 3.0
ADJECTIVE (1)
1. 
 of or resembling algae; 
The Collaborative International Dictionary of English v.0.48:
Algoid \Al"goid\, a. [L. alga + -oid.]
   Of the nature of, or resembling, an alga.
   [1913 Webster]
WordNet (r) 3.0 (2006):
algoid
    adj 1: of or resembling algae