The Collaborative International Dictionary of English v.0.48:

-oma \-o"ma\suff. [Gr. ?, ?.]
   A suffix used in medical terms to denote a morbid condition
   of some part, usually some kind of tumor; as in fibroma,
   glaucoma.
   [1913 Webster]

The Free On-line Dictionary of Computing (19 January 2023):

OMA

   Object Management Architecture.

   A set of standards under study by the OMG.

   (1994-11-11)