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4.NounA reclusive, reactionary or out-of-date person, especially if brutish.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