trog·lo·dyte 
(trŏglə-dīt′)
(trŏglə-dīt′)n.
1.
a. often Troglodyte A member of a fabulous or prehistoric race of people that lived in caves, dens, or holes.
b. A person considered to be reclusive, reactionary, out of date, or brutish.
2.
a. A nonhuman ape. Not in scientific use.
b. An animal that lives underground, as an ant or a worm. Not in scientific use.
[From Latin Trōglodytae, a people said to be cave dwellers, from Greek Trōglodutai, alteration (influenced by trōglē, hole, and -dutai, those who enter) of Trōgodutai.]
trog′lo·dytic (-dĭtĭk), trog′lo·dyti·cal (-ĭ-kəl) adj.