Lewis & Short

Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.

styrax (stŏrax, Sol. 33 med.; Isid. Orig. 17, 8, 5), ăcis, m., = στύραξ, a tree; and also the resinous gum of that tree, storax, Plin. 12, 25, 55, § 125; 24, 6, 15, § 24; Verg. Cir. 167.
Hence, styrăcĭnus, a, um, of or made from storax: oleum, Cael. Aur. Tard. 2, 7.