Succus \Suc"cus\, n.; pl. Succi. (Med.) The expressed juice of a plant, for medicinal use.

Succus entericus. [NL., literally, juice of the intestines.]

(Physiol.) A fluid secreted in small by certain glands (probably the glands of Lieberk["u]hn) of the small intestines. Its exact action is somewhat doubtful.

Source: Webster's Revised Unabridged Dictionary (1913)