Wordnet 3.0
NOUN (2)
1. 
 a member of the Mongoloid race; 
2. 
 a person suffering from Down syndrome (no longer used technically in this sense); 
ADJECTIVE (3)
1. 
 characteristic of or resembling a Mongol; 
- Example: "the mongoloid epicanthic fold"2. 
 of or pertaining to or characteristic of one of the traditional racial division of humankind including especially peoples of central and eastern Asia; 
3. 
 of or relating to or suffering from Down syndrome;; 
The Collaborative International Dictionary of English v.0.48:
Mongoloid \Mon"go*loid\, a. [Mongol + -oid.]
   Resembling a Mongol or the Mongols; having race
   characteristics, such as color, hair, and features, like
   those of the Mongols. --Huxley.
   [1913 Webster]
   2. Of, related to, or affected with, Down syndrome; -- not
      a technical term.
      [PJC]
The Collaborative International Dictionary of English v.0.48:
Mongoloid \Mon"go*loid\, n.
   A person affected with Down syndrome; -- not a technical
   term.
   [PJC] Mongols
WordNet (r) 3.0 (2006):
mongoloid
    adj 1: characteristic of or resembling a Mongol; "the mongoloid
           epicanthic fold"
    2: of or pertaining to or characteristic of one of the
       traditional racial division of humankind including especially
       peoples of central and eastern Asia
    3: of or relating to or suffering from Down syndrome;
    n 1: a member of the Mongoloid race
    2: a person suffering from Down syndrome (no longer used
       technically in this sense)
Moby Thesaurus II by Grady Ward, 1.0:
31 Moby Thesaurus words for "mongoloid":
   arrested, babbling, backward, blithering, burbling, crackbrained,
   cracked, crazy, cretinistic, cretinous, dithering, driveling,
   drooling, half-baked, half-witted, idiotic, imbecile, imbecilic,
   maundering, mentally defective, mentally deficient,
   mentally handicapped, mentally retarded, moronic, not all there,
   retarded, simple, simpleminded, simpletonian, slobbering,
   subnormal