1 a cave-dweller, esp. of prehistoric times.
2 a hermit.
3 derog. a wilfully obscurantist or old-fashioned person.
Derivatives:
troglodytic adj. troglodytical adj. troglodytism n.
Etymology: L troglodyta f. Gk troglodutes f. the name of an Ethiopian people, after trogle hole
Useful english dictionary. 2012.