The Collaborative International Dictionary of English v.0.48:

Troglodyte \Trog"lo*dyte\, n. [L. troglodytae, pl., Gr. ? one
   who creeps into holes; ? a hole, cavern (fr. ? to gnaw) + ?
   enter: cf. F. troglodyte.]
   1. (Ethnol.) One of any savage race that dwells in caves,
      instead of constructing dwellings; a cave dweller, or cave
      man. Most of the primitive races of man were troglodytes.
      [1913 Webster]

            In the troglodytes' country there is a lake, for the
            hurtful water it beareth called the "mad lake."
                                                  --Holland.
      [1913 Webster]

   2. (Zool.) An anthropoid ape, as the chimpanzee.
      [1913 Webster]

   3. (Zool.) The wren.
      [1913 Webster]

WordNet (r) 3.0 (2006):

troglodyte
    n 1: one who lives in solitude [syn: hermit, recluse,
         solitary, solitudinarian, troglodyte]
    2: someone who lives in a cave [syn: caveman, cave man,
       cave dweller, troglodyte]

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "troglodyte":
   Bronze Age man, Goth, Hominidae, Iron Age man, Neanderthal,
   Stone Age man, aboriginal, aborigine, ancient, animal,
   antediluvian, anthropoid, ape-man, autochthon, barbarian, brute,
   bushman, cave dweller, caveman, fossil man, hominid, humanoid,
   man of old, missing link, preadamite, prehistoric man, prehuman,
   primate, primitive, protohuman, savage



The Jargon File (version 4.4.7, 29 Dec 2003):

troglodyte
 n.

    [Commodore]

    1. A hacker who never leaves his cubicle. The term gnoll (from Dungeons &
    Dragons) is also reported.

    2. A curmudgeon attached to an obsolescent computing environment. The
    combination ITS troglodyte was flung around some during the Usenet and
    email wringle-wrangle attending the 2.x.x revision of the Jargon File; at
    least one of the people it was intended to describe adopted it with pride.


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

troglodyte

    (Commodore) 1. A hacker who never leaves his cubicle.
   The term "Gnoll" (from Dungeons & Dragons) is also reported.

   2. A curmudgeon attached to an obsolescent computing
   environment.  The combination "ITS troglodyte" was flung
   around some during the Usenet and e-mail wringle-wrangle
   attending the 2.x.x revision of the Jargon File; at least
   one of the people it was intended to describe adopted it with
   pride.

   [Jargon File]

   (1995-01-11)


The Devil's Dictionary (1881-1906):

TROGLODYTE, n.  Specifically, a cave-dweller of the paleolithic
period, after the Tree and before the Flat.  A famous community of
troglodytes dwelt with David in the Cave of Adullam.  The colony
consisted of "every one that was in distress, and every one that was
in debt, and every one that was discontented" -- in brief, all the
Socialists of Judah.