The Collaborative International Dictionary of English v.0.48:

pallor \pal"lor\, n. [L., fr. pallere to be or look pale. See
   Pale, a.]
   Paleness; want of color; pallidity; as, pallor of the
   complexion. --Jer. Taylor.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pallor
    n 1: unnatural lack of color in the skin (as from bruising or
         sickness or emotional distress) [syn: lividness,
         lividity, luridness, paleness, pallidness,
         pallor, wanness, achromasia]