sap-, sapi-
(Latin: wise, wisdom, to be wise, to have wisdom; to know, knowledge; to taste [of], to perceive)
Don't confuse this sap-, sapi- with another sap- [sapo-] that means "soap" or another sap-, sapro- which means, "rotten, putrid".
Inter-related cross references, directly or indirectly, involving word units meaning "know, knowledge; learn, learning": cogni-; discip-; gno-; histor-; intellect-; learn, know; math-; sci-; sopho-.