The Collaborative International Dictionary of English v.0.48:

Sheepfold \Sheep"fold`\, n.
   A fold or pen for sheep; a place where sheep are collected or
   confined.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sheepfold
    n 1: a pen for sheep [syn: fold, sheepfold, sheep pen,
         sheepcote]

Easton's 1897 Bible Dictionary:

Sheep-fold
   a strong fenced enclosure for the protection of the sheep
   gathered within it (Num. 32:24; 1 Chr. 17:7; Ps. 50:9; 78:70).
   In John 10:16 the Authorized Version renders by "fold" two
   distinct Greek words, aule and poimne, the latter of which
   properly means a "flock," and is so rendered in the Revised
   Version. (See also Matt. 26:31; Luke 2:8; 1 Cor. 9:7.) (See FOLD.)