What is so near the sun as to be obscured or eclipsed by his light, as the moon or planets when not more than eight degrees and a half from the sun. [Obs.] Planets that are oft combust. Milton called?

combust — (Astron.) So near the sun as to be obscured or eclipsed by his light, as the moon or planets when not more than eight degrees and a half from the sun. [Obs.] Planets that are oft combust. Milton. (Webster's 1913.)