Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sūcĭnum (succ-), i, n. [sucus], amber, usu. called electrum, Plin. 37, 2, 11, § 30; Mart. 3, 65, 5; 5, 37, 11; Juv. 6, 573 al.
sūcĭnus (succ-), a, um, adj. [sucinum], of amber: gutta, Mart. 6, 15, 2: gemma, id. 4, 59, 2: novacula, Plin. 22, 23, 47, § 99.