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"

Moby Thesaurus II by Grady Ward, 1.0:

96 Moby Thesaurus words for "serried":
   articulated, assembled, bristling, catenated, ceaseless, close,
   close-knit, close-textured, close-woven, compact, compacted,
   compressed, concatenated, concentrated, concrete, condensed,
   congested, connected, consolidated, constant, continual, continued,
   continuing, continuous, crammed, crammed full, crawling, crowded,
   cyclical, dense, direct, endless, featureless, firm, full, gapless,
   gluey, hard, heavy, immediate, impenetrable, impermeable,
   incessant, interminable, jam-packed, jammed, joined, jointless,
   linked, massive, monotonous, never-ending, nonporous, nonstop,
   packed, perennial, periodic, populous, ranged, ranked, recurrent,
   repetitive, round-the-clock, running, saw-toothed, sawtooth,
   seamless, serrated, smooth, solid, stable, steady, straight,
   substantial, swarming, teeming, thick, thick-growing, thickset,
   tiered, twenty-four-hour, unbroken, unceasing, undifferentiated,
   unending, uniform, unintermitted, unintermittent, unintermitting,
   uninterrupted, unrelieved, unremitting, unstopped, viscid, viscose,
   viscous