troglodyte
trog·lo·dyte
noun
1.
one who lives in solitude
2.
Origin
Learned borrowing from Latin Trōglodytae (“cave-dwelling people”), from Ancient Greek τρωγλοδύτης (trōglodútēs, “one who dwells in holes”), from τρώγλη (trṓglē, “hole”) + δύω (dúō, “to get into”).
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.