The Collaborative International Dictionary of English v.0.48:

Serry \Ser"ry\, v. t. [imp. & p. p. Serried; p. pr. & vb. n.
   Serrying.] [F. serrer, LL. serrare, serare, from L. sera a
   bar, bolt; akin to serere to join or bind together. See
   Serries.]
   To crowd; to press together.

   Note: [Now perhaps only in the form serried, p. p. or a.]
         [1913 Webster]