> as lemmas
prestellar
prestellar adj.
Brit. 
/(ˌ)priːˈstɛlə/
, /(ˌ)priːˈstɛlə/U.S. /ˌpriˈstɛlər/
Astronomy existing or occurring before the formation of stars; spec. constituting material which subsequently goes to form a star or stars./ˌpriˈstɛlər/ΘΚΠ
the world > the universe > star > kind of star > protostar > [adjective]
prestellar1897
protostellar1968
presolar1973
1897 Harper's Mag. Mar. 555/2 Mr. Lanyard..suggests that the visible nebulæ may not be nascent stars, but emanations from stars, and the true pre-stellar nebulæ are invisible until condensed to stellar proportions.
1952 C. Payne-Gaposchkin Stars in Making (1953) ii. 43 Nebulae like the one in Orion must represent the primitive prestellar material.
1978 Sci. Amer. Apr. 112/1 The observational signpost for this prestellar stage is the emission by the cloud's many molecules of radio waves at wavelengths measured in millimeters.
1999 Science 12 Mar. 1719/1 The s of low-mass prestellar clumps has been revealed by millimeter observations of nearby star-forming regions.
<
as lemmas