The Collaborative International Dictionary of English v.0.48:

Steatomatous \Ste`a*tom"a*tous\ (-t[o^]m"[.a]*t[u^]s or
   -t[=o]"m[.a]-; 277), a. [Cf. F. st['e]atomateux.] (Med.)
   Of the nature of a steatoma.
   [1913 Webster]