Etymology
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Words related to earth

*er- (2)
Proto-Indo-European root meaning "earth, ground." It forms all or part of: aardvark; aardwolf; earth; earthen; earthy.

It is the hypothetical source of/evidence for its existence is provided by: Old English eorþe "ground, soil, dirt, dry land," Old Norse jörð, Old High German erda, Gothic airþa; Middle Irish -ert "earth."
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aardvark (n.)

also aard-vark, South African groundhog, 1833 (in German from 1824), from Afrikaans Dutch aardvark, literally "earth-pig" (it burrows), from aard "earth," from Proto-Germanic *ertho- (see earth (n.)) + vark "pig," from Middle Dutch varken "small pig," which is from Proto-Germanic *farhaz (source also of Old High German farah, German Ferkel "young pig, sucking pig," a diminutive form; Old English fearh), from PIE root *porko- "young pig."

aardwolf (n.)
Origin and meaning of aardwolf

also aard-wolf, "small, insectivorous mammal native to East and Southern Africa, related to the hyena," 1833, from Afrikaans Dutch aardwolf, literally "earth-wolf," from aard "earth" (see earth (n.)) + wolf "wolf" (see wolf (n.)).

earth-bound (adj.)

c. 1600, "firmly fixed in or on the earth," from earth (n.) + bound (adj.). Figurative sense "bound by earthly ties or interests" is from 1869.

earthen (adj.)
early 13c., "made of earth;" see earth (n.) + -en (2). Not attested in Old English (where eorðen meant "of or in the earth"). Cognate of Old High German irdin, Dutch aarden, Gothic airþeins. Meaning "made of clay" is attested from late 14c.
earthlight (n.)

also earth-light, "sunlight reflected from Earth's surface and clouds," especially as illuminating the otherwise dark part of the moon, 1810, from earth (n.) + light (n.). Earthshine in same sense is from 1814.

earthling (n.)
Old English yrþling "plowman" (see earth (n.) + -ling); the sense of "inhabitant of the earth" is from 1590s and might be a re-formation, as the word seems to be missing in Middle English. Compare earthman. Earlier in this sense was earthite (1825).
earthly (adj.)

Old English eorþlic "worldly, pertaining to this world" (as opposed to spiritual or heavenly); see earth (n.) + -ly (1). The sense "belonging to or originating in the earth" is from mid-15c.

earthman (n.)
also earth-man, 1860, "a spirit of nature; a demon who lives below the ground," from earth (n.) + man (n.). Science fiction sense of "inhabitant of the planet Earth" first attested 1949 in writing of Robert Heinlein.
earthquake (n.)

"movement or vibration of a part of the earth's crust," late 13c., eorthequakynge, from earth + quake (n.). In this sense Old English had eorðdyn, eorðhrernes, eorðbeofung, eorðstyrung.