Endicium Share definition Flag the act of keeping guard or protective watch: watch and ward. a person who is under the protection of another. Pronunciation en-dish-ee-uh m. The security guard is responsible for the endicium (protection) of his client. Endicium by Latin Ins December 9, 2008 0 0 Get merch Get the Endicium mug. Buy Now — $32.95 See more merch