The Collaborative International Dictionary of English v.0.48:

Cranny \Cran"ny\ (kr[a^]n"n[y^]), n.; pl. Crannies (-n[i^]z).
   [F. cran notch, prob. from L. crena (a doubful word).]
   1. A small, narrow opening, fissure, crevice, or chink, as in
      a wall, or other substance.
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            In a firm building, the cavities ought not to be
            filled with rubbish, but with brick or stone fitted
            to the crannies.                      --Dryden.
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            He peeped into every cranny.          --Arbuthnot.
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   2. (Glass Making) A tool for forming the necks of bottles,
      etc.
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