obsessor, ōris, m. [obsideo], one who sits, stays, abides in a place; a frequenter, haunter.
I In gen. (only ante-class. and poet.): hoc ego fui hodie solus obsessor fori, sai in the forum alone , Plaut. Ps. 3, 2, 18: vivarum aquarum (of a water-snake ), Ov. F. 2, 259.—
II In partic., milit., a besieger, invester, blockader : obsessor curiae, Cic. Dom. 5, 13: Luceriae, Liv. 9, 15, 3: plus pavoris obsessis quam obsessoribus intulit, Tac. H. 3, 73.