troglo-, trogl- +

(Greek > Latin: cave; thriving in caves; cave dweller)

The Greek troglo- also means, "one who creeps into holes" and "a hole formed by gnawing".

Nannus troglodytes
1. European wren: a genus of small passerine birds in the wren family.
2. Etymology: the genus name (Greek troglodytai, from trogle, "a hole" (properly "a hole formed by gnawing" and dyein, "to enter") refers to the tendency of these wrens to enter small crevices and similar areas as they look for food.
Troglichthys rosae
A cave fish.
troglobiont
1. A cave-dwelling organism.
2. Any creature having a cave-dwelling mode of life.
3. An animal living entirely in the dark parts of caves.
4. An organism found only in caves or subterranean passages.
troglobite
A creature which lives entirely in the dark parts of caves.

Such troglobitic creatures have become specifically adapted for life in total darkness and over time they have evolved to develop improved senses of smell, taste, and vibration detection; while losing anatomical features that are unnecessary without light; such as, eyes and pigmentation.

Here is special information about troglobites.

troglobitic, troglobiotic
1. A reference to any creature having a cave-dwelling mode of life.
2. Descriptive of an animal living entirely in the dark parts of caves.
troglocole, troglocolous
Living in subterranean caves or passages; also, cavernicole, cavernicolous.
troglocolid
A tendency of organisms to live in subterranean caves or passages.
troglocoline
A reference to organisms that live in subterranean caves or passages.
troglodyte
1. A prehistoric cave dweller or a prehistoric race of people who lived in caves, dens, or holes.
2. Figuratively, referring to someone who resembles or suggests a troglodyte in appearance, ways of living, or degradation (decline in quality or performance) or brutality of nature.
3. A person living in seclusion; someone who is considered to be reclusive, reactionary, out of date.
4. Someone who is unacquainted with affairs of the world.
5. An animal living underground.
6. A computer hacker who never leaves his cubicle. The term "gnoll" (from Dungeons and Dragons) is also reported.
7. A curmudgeon (bad-tempered, disagreeable, or stubborn) attached to an obsolescent computing environment.

The term troglodyte doesn't necessarily apply just to prehistoric cave dwellers. It is said to also describe someone who lives in a dingy domicile or people who are so socially inept or culturally deprived that they seem to have just emerged from a cave into the "blinding light of civilization" or a person whose thinking or behavior is considered to be uncivilized and backward.

Troglodytes aedon
1. House wren; common American wren that nests around houses.
2. Of several small active brown birds of the northern hemisphere with short upright tails that feed on insects.
3. A reference to the tendency of these wrens to enter small crevices and similar areas as they forage for food.
troglodytic
1. A reference to anyone who dwells in a cave.
2. A descriptive term for someone who lives in solitude.
troglodytical
Of or pertaining to a troglodyte, or a dweller in caves.
Troglodytidae
The family consisting of the wrens, formerly also including the thrashes, mockingbirds, and allied forms.

Sometimes regarded as a subfamily of Timaliidae called Troglodytinae and so called because of a reference to the tendency of the wrens to enter small crevices and similar areas as they look for food.

troglodytish
Resembling or characteristic of a troglodyte.
troglodytism
The condition of a troglodyte or the habit of dwelling in caves.

Related "cave, cavern" word sources: cav-, cavern; speleo-; spelunc-, spelunk-; stalac-, stalag-.