The Collaborative International Dictionary of English v.0.48:
Steatoma \Ste`a*to"ma\ (-t[=o]"m[.a]), n. [L., fr. Gr.
stea`twma, fr. steatoy^n to turn into tallow or suet, fr.
ste`ar, -atos, fat, suet.] (Med.)
A cyst containing matter like suet.
[1913 Webster]