The Collaborative International Dictionary of English v.0.48:

Presbyter \Pres"by*ter\, n. [L. an elder, fr. Gr. ?. See
   Priest.]
   [1913 Webster]
   1. An elder in the early Christian church. See 2d Citation
      under Bishop, n., 1.
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   2. (Ch. of Eng. & Prot. Epis. Ch.) One ordained to the second
      order in the ministry; -- called also priest.
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            I rather term the one sort presbyter than priest.
                                                  --Hooker.
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            New presbyter is but old priest writ large.
                                                  --Milton.
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   3. (Presbyterian Ch.) A member of a presbytery whether lay or
      clerical.
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   4. A Presbyterian. [Obs.] --Hudibras.
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The Collaborative International Dictionary of English v.0.48:

Priest \Priest\, n. [OE. prest, preost, AS. pre['o]st, fr. L.
   presbyter, Gr. ? elder, older, n., an elder, compar. of ? an
   old man, the first syllable of which is probably akin to L.
   pristinus. Cf. Pristine, Presbyter.]
   [1913 Webster]
   1. (Christian Church) A presbyter elder; a minister;
      specifically:
      (a) (R. C. Ch. & Gr. Ch.) One who is authorized to
          consecrate the host and to say Mass; but especially,
          one of the lowest order possessing this power.
          --Murdock.
      (b) (Ch. of Eng. & Prot. Epis. Ch.) A presbyter; one who
          belongs to the intermediate order between bishop and
          deacon. He is authorized to perform all ministerial
          services except those of ordination and confirmation.
          [1913 Webster]

   2. One who officiates at the altar, or performs the rites of
      sacrifice; one who acts as a mediator between men and the
      divinity or the gods in any form of religion; as, Buddhist
      priests. "The priests of Dagon." --1 Sam. v. 5.
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            Then the priest of Jupiter . . . brought oxen and
            garlands . . . and would have done sacrifice with
            the people. --Acts xiv. 13.
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            Every priest taken from among men is ordained for
            men in things pertaining to God, that he may offer
            both gifts and sacrifices for sins.   --Heb. v. 1.
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   Note: In the New Testament presbyters are not called priests;
         but Christ is designated as a priest, and as a high
         priest, and all Christians are designated priests.
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The Collaborative International Dictionary of English v.0.48:

Priest \Priest\, v. t.
   To ordain as priest.
   [1913 Webster]

WordNet (r) 3.0 (2006):

priest
    n 1: a clergyman in Christian churches who has the authority to
         perform or administer various religious rites; one of the
         Holy Orders
    2: a person who performs religious duties and ceremonies in a
       non-Christian religion [syn: priest, non-Christian
       priest]