Proto-Indo-European root meaning "stiff."
It is the hypothetical source of/evidence for its existence is provided by: Greek stereos "solid," sterizein "to support," sterphnios "stiff, rigid," sterphos "hide, skin;" Sanskrit sthirah "hard, firm," Persian suturg "strong;" Lithuanian storas "thick," strėgti "to become frozen;" Old Church Slavonic trupeti, Lithuanian tirpstu, tirpti "to become rigid;" Old Church Slavonic strublu "strong, hard," staru "old" (hence Russian stary "old"); Old English starian "to stare," stearc "stiff, strong, rigid," steorfan "to die," literally "become stiff," styrne "severe, strict."
Proto-Indo-European root meaning "star." Buck and others doubt the old suggestion that it is a borrowing from Akkadian istar "venus." The source of the common Balto-Slavic word for "star" (Lithuanian žvaigždė, Old Church Slavonic zvezda, Polish gwiazda, Russian zvezda) is not explained.
It forms all or part of: aster; asterisk; asterism; asteroid; astral; astro-; astrobiology; astrobleme; astrognosy; astroid; astrolabe; astrolatry; astrology; astromancy; astronaut; astronomy; AstroTurf; constellation; disaster; Estella; Esther; instellation; interstellar; lodestar; star; stardust; starfish; starlet; starlight; starry; stellar; stellate.
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit star-; Hittite shittar, Greek aster "star," with derivative astron; Latin stella, Breton sterenn, Welsh seren "star."