interastral

From inter- +‎ astral.

interastral (not comparable)

1. (archaic) interstellar
   • 1881, James Samuelson, Sir William Crookes, The Journal of Science, and Annals of Astronomy, Biology, Geology, Industrial Arts, Manufactures, and Technology, volume 18, page 643:

     Let us suppose that gravitation affects all matter, and that the rare matter of space is more condensed around the spheres than in interastral space.

• intertarsal

interastral (feminine interastrale, masculine plural interastraux, feminine plural interastrales)

1. interstellar

• “interastral”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

Borrowed from French interastral. By surface analysis, inter- +‎ astral.

interastral m or n (feminine singular interastrală, masculine plural interastrali, feminine and neuter plural interastrale)

1. interstellar