An Etymological Dictionary of Astronomy and Astrophysics

Pertaining to, consisting of, or representing the Earth as distinct from other planets.

Etymology (EN): From L. terrestris “earthly,” from terra “earth,” literally “dry land” (as opposed to “sea”); from PIE base *ters- “to dry” (cf. Pers. tešné “thirsty;” Mid.Pers. tašnak “thirsty;” Av. taršu- “dry,” taršna- “thirst;” Skt. trsta- “dry,” tars- “to be thirsty;”
Gk. teresesthai “to become or be dry,” L. torrere “to dry up, roast,” Goth. þaursus “dry, barren,” O.H.G. derren “to make dry,” durst “thirst;” Ger. dürr “arid;” O.E. þurstig “thirsty”).

Etymology (PE): Zamini adj. of zamin, variant zami “earth, floor, land;”
Mid.Pers. zamig; Av. zam- “the earth;” cf. Skt. ksam- “the ground, earth;” Gk. khthôn, khamai “on the ground;” L. homo “earthly being” (as in homo sapiens,
homicide, humble, humus, exhume), humus “the earth;” O.Russ. zemi “land, earth;” PIE root *dh(e)ghom “earth”.