The Collaborative International Dictionary of English v.0.48:

Ceroma \Ce*ro"ma\, n. [L., fr. Gr. ? ointment for wrestlers, the
   place for wrestling, fr. khroy^n to wax over, fr. khro`s
   wax.]
   1. The unguent (a composition of oil and wax) with which
      wrestlers were anointed among the ancient Romans.
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   2. (Anc. Arch.) That part of the baths and gymnasia in which
      bathers and wrestlers anointed themselves.
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   3. (Zool.) The cere of birds.
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