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preplanetary
preplanetary adj.
Brit. 
/(ˌ)priːˈplanᵻt(ə)ri/
, /(ˌ)priːˈplanᵻt(ə)ri/U.S. /ˌpriˈplænəˌtɛri/
Astronomy existing before the formation of planets; spec. constituting material from which the planets were subsequently formed./ˌpriˈplænəˌtɛri/ΘΚΠ
the world > the universe > planet > [adjective]
planetical?a1563
planetary1593
planetal1624
planetic1631
planetarian1652
planeted1745
planetocentric1856
preplanetary1869
protoplanetary1957
1869 C. F. Winslow Force & Nature 77 [Laplace] conceived and propounded the idea that the solar system in its preplanetary periods had existed in nebulous conditions as a vast volume of molecular dust and vapour.
1968 R. A. Lyttleton Myst. Solar Syst. ii. 54 Evidence seems to suggest that the meteorites do not represent original pre-planetary material but are a later product of the solar system.
1989 C. J. Avers Process & Pattern in Evol. ii. 42 (caption) The solar system is believed to have begun as a diffuse cloud of dust and gases, which contracted over time to form the central sun (star) and whirling disks of preplanetary material.
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