Definitions
1.nounA member of a supposed prehistoric race that lived in caves or holes, a caveman.
2.noun(by extension) Anything that lives underground."The cave was populated by albino scorpions, blind salamanders, and other troglodytes."
3.nounA reclusive, reactionary or out-of-date person, especially if brutish.
4.nounThe Eurasian wren, Troglodytes troglodytes.
5.nounA person who chooses not to keep up-to-date with the latest software and hardware.