The Collaborative International Dictionary of English v.0.48:

Squama \Squa"ma\ (skw[=a]"m[.a]), n.; pl. Squamae (-m[=e]).
   [L. a scale.] (Med.)
   A scale cast off from the skin; a thin dry shred consisting
   of epithelium.
   [1913 Webster]

WordNet (r) 3.0 (2006):

squama
    n 1: a protective structure resembling a scale