The Collaborative International Dictionary of English v.0.48:

Lipoma \Li*po"ma\ (l[i^]*p[=o]"m[.a]), n. [NL., from Gr. li`pos
   fat + -oma.] (Med.)
   A tumor consisting of fat or adipose tissue. --
   Li*pom"a*tous (-p[o^]m"[.a]*t[u^]s), a.
   [1913 Webster]