Etymology
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Words related to Gaia

tellurian (adj.)

"pertaining to the earth," 1846, from -ian + Latin tellus (genitive telluris) "earth, land, ground; the earth" (related to Tellus, Roman goddess of the earth), probably from PIE root *telho- "ground, floor" (source also of Sanskrit talam "plain, sole of the foot;" Greek telia "dice board;" Latvian telint "to spread out;" Lithuanian tils "bottom of a barge, flooring," patalas "bed;" Old Prussian tallus "floor;" Old Church Slavonic tilo "floor;" Russian potolok "ceiling;" Old Irish talam "earth;" Old Norse ilja, Middle Dutch dele "plank").  Or possibly from PIE  *telh- "to bear." As a noun, "inhabitant of Earth" (with reference to supposed inhabitants of other worlds) from 1847.

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apogee (n.)
"point at which the moon is farthest from the earth," 1590s, from French apogée or directly from Latin apogaeum, from Greek apogaion (diastema) "(distance) away from the earth," from apogaion, neuter adjective, "from land," here in a specialized sense "away from the earth," from apo "off, away" (see apo-) + gaia/ge "earth" (see Gaia).

Figurative sense "climax, culmination" is from 1640s. A term from Ptolemaic astronomy, which regarded the earth as the center of the universe and applied the word to the sun and planets; for these bodies it was displaced in the Copernican system by aphelion. Adjective forms are apogeal, apogean, apogeic.
Demeter 

in Greek religion, the Olympian goddess of agriculture and useful vegetation, protectress of the social order and of marriage, mother of Persephone, from Greek Dēmētēr; the second element generally given as māter (see mother (n.1)); the first element possibly from da, Doric form of Greek "earth" (see Gaia), but Liddell & Scott find this "improbable" and Beekes writes, "there is no indication that [da] means 'earth', although it has also been assumed in the name of Poseidon." The Latin masc. proper name Demetrius means "son of Demeter."

geo- 

word-forming element meaning "earth, the Earth," ultimately from Greek geo-, combining form of Attic and Ionic "the earth, land, a land or country" (see Gaia).

geode (n.)

rounded stone with a hollow center lined with crystals, 1670s (in Greek form from 1610s), from French géode, from Latin geodes, name of a certain precious stone, from Greek geodes "earthy, earth-like, with deep soil," from "earth" (Homeric gaia; see Gaia) + -oides, adjective suffix, "characterized by" (see -oid). Perhaps so called in reference to the rough crust in which the crystals are hidden. Related: Geodic.

geodesy (n.)

1560s, "the art of land surveying," from Modern Latin geodaesia, from Greek geodaisia "division of the earth;" ultimately from "earth" (see Gaia) + stem of daiein "to divide," from PIE *dai-, extended form of root *da- "to divide." In modern use it refers to mathematical calculations derived from measuring large portions of the earth's surface. In this sense, in reference to structures, from 1936.

geomancy (n.)

"art of divination by means of signs derived from the earth," late 14c., from Old French géomancie, from Medieval Latin geomantia, from late Greek *geomanteia, from geo-, combining form of "earth" (see Gaia) + manteia "divination" (see -mancy). Related: Geomantic; geomantical.

geometry (n.)

early 14c., also gemetrie, gemetry, from Old French geometrie (12c., Modern French géométrie), from Latin geometria, from Greek geometria "measurement of earth or land; geometry," from combining form of "earth, land" (see Gaia) + -metria "a measuring of" (see -metry). Old English used eorðcræft "earth-craft" as a loan-translation of Latin geometria.

geophagy (n.)

"dirt-eating," 1820, from Greek *geophagia (according to OED the actual Greek is geotragia), from geo-, combining form of "earth" (see Gaia) + phagein "to eat." See also pica (n.2).

A diseased appetite ... prevails in several parts of Alabama, where they eat clay. I heard various speculations on the origin of this singular propensity, called 'geophagy' in some medical books. [Lyell, "Second Visit to U.S.," 1850]