The Collaborative International Dictionary of English v.0.48:

dolor \do"lor\, n. [OE. dolor, dolur, dolour, F. douleur, L.
   dolor, fr. dolere. See 1st Dole.]
   Pain; grief; distress; anguish. [Written also dolour.]
   [Poetic]
   [1913 Webster]

         Of death and dolor telling sad tidings.  --Spenser.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dolor
    n 1: (poetry) painful grief [syn: dolor, dolour]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "dolor":
   Schmerz, ache, aches and pains, aching, agony, blow, cramp, cut,
   discomfort, distress, grief, hurt, hurting, injury, lesion,
   malaise, misery, nasty blow, pain, pang, passion, shock, sore,
   sore spot, spasm, stress, stress of life, stroke, suffering,
   tender spot, throes, wound, wrench