The Collaborative International Dictionary of English v.0.48:

Minister \Min"is*ter\, v. t. [imp. & p. p. Ministered; p. pr.
   & vb. n. Ministering.] [OE. ministren, OF. ministrer, fr.
   L. ministrare. See Minister, n.]
   To furnish or apply; to afford; to supply; to administer.
   [1913 Webster]

         He that ministereth seed to the sower.   --2 Cor. ix.
                                                  10.
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         We minister to God reason to suspect us. --Jer. Taylor.
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Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "ministering":
   accessory, adjuvant, agential, agentival, agentive, ancillary,
   assistant, assisting, attendant, attending, auxiliary, conducive,
   employable, facilitating, favoring, forwarding, fostering, handy,
   helpful, helping, instrumental, intermediary, mediating,
   mediatorial, menial, ministerial, ministrant, nurtural, nutricial,
   promoting, serviceable, servile, serving, servitorial, subservient,
   subsidiary, useful, waiting