Webster’s Revised Unabridged Dictionary · 1913
Satan
Sa′tan, n. [Heb. sātān an adversary, fr. sātan to be adverse, to persecute: cf. Gr. Σατᾶν, Σατανᾶς, L. Satan, Satanas.] The grand adversary of man; the Devil, or Prince of darkness; the chief of the fallen angels; the archfiend.
I beheld Satan as lightning fall from heaven. Luke x. 18.