The Collaborative International Dictionary of English v.0.48:

Thicket \Thick"et\, n. [AS. [thorn]iccet. See Thick, a.]
   A wood or a collection of trees, shrubs, etc., closely set;
   as, a ram caught in a thicket. --Gen. xxii. 13.
   [1913 Webster]

WordNet (r) 3.0 (2006):

thicket
    n 1: a dense growth of bushes [syn: brush, brushwood,
         coppice, copse, thicket]

Moby Thesaurus II by Grady Ward, 1.0:

35 Moby Thesaurus words for "thicket":
   batch, boscage, bosket, brake, bunch, canebrake, ceja, chamisal,
   chaparral, clump, cluster, coppice, copse, copsewood, covert, crop,
   frith, group, grouping, groupment, grove, hassock, knot, lot, mess,
   motte, shock, slew, spinney, stook, thickset, tuft, tussock, wisp,
   wood



The Free On-line Dictionary of Computing (30 December 2018):

thicket

    Multiple files output from some operation.

   The term has been heard in use at Microsoft to describe the
   set of files output when Microsoft Word does "Save As a
   Web Page" or "Save as HTML".  The process can result in a
   main XML or HTML file, a graphic file for each
   image in the original, a CSS file, etc.

   This can be an issue as XML can be used as the default
   format in Office 2000, and document management systems
   can't yet cope with the relationship between the files in a
   thicket when checking in and out.

   (2001-09-01)