Spissamentum, spissamenti, n. g. Col. And thing put into ointments, to make them thicke. Also hay, wooll, cotten, or like matter, wherewith a cleft or hole is stopped.Spissamentum. Sen. And thing that is vsed to stuffe small things lying togither, to make them lye close.
Lewis and Short: Latin dictionary
spissāmentum, i, n. [spisso], that which is used to compress or stop up any thing, a stopple, plug (post-Aug.): firmiori (quam cera) spissamento opus est, Sen. Ep. 31, 1: spissamento facto de harundinum foliis, Col. 12, 49, 4: faeniculi, id. 12, 49, 4, 6; 12, 7, 3; 12, 9, 2.