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]

The Collaborative International Dictionary of English v.0.48:

Serried \Ser"ried\, a. [See Serry.]
   Crowded; compact; dense; pressed together.
   [1913 Webster]

         Nor seemed it to relax their serried files. --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

serried
    adj 1: (especially of rows as of troops or mountains) pressed
           together; "in serried ranks"