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]