The Collaborative International Dictionary of English v.0.48:

Hydrocephaloid \Hy`dro*ceph"a*loid\, a. [Hydrocephalus + -oid.]
   (Med.)
   Resembling hydrocephalus.
   [1913 Webster]

   Hydrocephaloid affection (Med.), the group of symptoms
      which follow exhausting diarrhea in young children,
      resembling those of acute hydrocephalus, or tubercular
      meningitis.
      [1913 Webster]