Entries linking to telluric
"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.
Middle English -ik, -ick, word-forming element making adjectives, "having to do with, having the nature of, being, made of, caused by, similar to," from French -ique and directly from Latin -icus or from cognate Greek -ikos "in the manner of; pertaining to." From PIE adjective suffix *-(i)ko, which also yielded Slavic -isku, adjectival suffix indicating origin, the source of the -sky (Russian -skii) in many surnames. In chemistry, indicating a higher valence than names in -ous (first in benzoic, 1791).
In Middle English and after often spelled -ick, -ike, -ique. Variant forms in -ick (critick, ethick) were common in early Modern English and survived in English dictionaries into early 19c. This spelling was supported by Johnson but opposed by Webster, who prevailed.