The Collaborative International Dictionary of English v.0.48:

Snapshot \Snap"shot`\, n.
   1. Commonly

WordNet (r) 3.0 (2006):

snapshot
    n 1: an informal photograph; usually made with a small hand-held
         camera; "my snapshots haven't been developed yet"; "he
         tried to get unposed shots of his friends" [syn:
         snapshot, snap, shot]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "snapshot":
   Telephoto, Wirephoto, aerial photograph,
   black-and-white photograph, candid photograph, cheesecake,
   chronophotograph, color photograph, color print, diapositive,
   heliochrome, heliograph, montage, mug, mug shot, photo,
   photobiography, photochronograph, photograph, photomap,
   photomicrograph, photomontage, photomural, picture, pinup,
   portrait, shot, slide, snap, still, still photograph,
   telephotograph, transparency