sacculine,a.|ˈsækjʊlaɪn| [ad.mod.L. sacculīnus, f.saccul-us little bag: see sacculus and -ine.] Of or belonging to the genus sacculina. 1883H. Drummond Nat. Law in Spir. W. 344 But instead of rising to its opportunities, the sacculine Nauplius, having reached a certain point turned back.