noun

1. any of the prehistoric people who lived in caves; cave man
2. 1. a person who chooses to live alone in seclusion; recluse
   2. anyone who lives in a primitive or degenerate fashion
3. an anthropoid ape

Etymology: L troglodyta < Gr trōglodytēs, one who creeps into holes, cave dweller < trōglē, a hole, cave (< trōgein, to gnaw < IE *trōg- < base *ter-, to rub, grind > throw) + dyein, to creep in, enter