كَيْسَانُ

(tropical:) a proper name for Perfidy; (IAar, S, A, K;) as also أَبُو كَيْسَانَ: (IAar:) of the dialect of Teiyi: and derived from كَيْسٌ. (Kr.) You say, رَكِبَ كَيْسَانَ (tropical:) He acted perfidiously. (A.)