The Collaborative International Dictionary of English v.0.48:

Succor \Suc"cor\, v. t. [imp. & p. p. Succored; p. pr. & vb.
   n. Succoring.] [OE. socouren, OF. sucurre, soucourre,
   secorre, F. secourir, L. succurrere, succursum, to run under,
   run to the aid of, help, succor; sub under + currere to run.
   See Current.]
   To run to, or run to support; hence, to help or relieve when
   in difficulty, want, or distress; to assist and deliver from
   suffering; to relieve; as, to succor a besieged city.
   [Written also succour.]
   [1913 Webster]

         He is able to succor them that are tempted. --Heb. ii.
                                                  18.
   [1913 Webster]

   Syn: To aid; assist; relieve; deliver; help; comfort.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Succor \Suc"cor\, n. [OE. socours, sucurs, OF. sucurs, socors,
   secors, F. secours, L. succursus, fr. L. succurrere. See
   Succor, v. t.]
   1. Aid; help; assistance; esp., assistance that relieves and
      delivers from difficulty, want, or distress. "We beseech
      mercy and succor." --Chaucer.
      [1913 Webster]

            My noble father . . .
            Flying for succor to his servant Bannister. --Shak.
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   2. The person or thing that brings relief.
      [1913 Webster]

            This mighty succor, which made glad the foe.
                                                  --Dryden.
      [1913 Webster]

WordNet (r) 3.0 (2006):

succor
    n 1: assistance in time of difficulty; "the contributions
         provided some relief for the victims" [syn: relief,
         succor, succour, ministration]
    v 1: help in a difficult situation [syn: succor, succour]