An Etymological Dictionary of Astronomy and Astrophysics

A prefix meaning “old, ancient” especially in reference to former geologic time periods, e.g. → paleoclimatology, → paleolithic, and
→ paleomagnetism.

Etymology (EN): From Gk. palaio-, combining form of palaios “old, ancient,” from palai “long ago, far back,” from PIE root *kwel- “to turn, move about,” also “far”

Etymology (PE): Pârin, pâriné “ancient,” also “last year” (contraction of pâr sâl), related to pir “old;” Mid.Pers. pir “old, aged, ancient;” Av. parô (adv.) “before, before (of time), in front (of space);” cf. Skt. puáh, combining form of puras “before (of time and place), in front, in advance.”
Dirin, diriné “old, ancient, of times past,” from dir “old, antique; a long while” + suffix -in. The first component
from Mid.Pers. dêr, variants dagr, drâz “long”
(Mod.Pers. derâz “long,” variant Laki, Kurdi derež);
O.Pers. darga- “long;” Av. darəga-, darəγa- “long,” drājištəm “longest;” cf. Skt. dirghá- “long (in space and time);” L. longus “long;” Gk. dolikhos “elongated;” O.H.G., Ger. lang; Goth. laggs “long;” PIE base *dlonghos- “long.” The second component -in adj. suffix, from Mid.Pers. -ên (as in âhênên, zarrên), from Av. -aēna- (ayanhaēna- “made of iron,” zaranaēna- “golden”); cf. Skt. -ēna-.