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The word bombycum could not be parsed. Trying a normal dictionary lookup:
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† bombȳcĭae hărundĭnes = βομβυκίας κάλαμος (Theophr. H. P. 4, 12), reeds suitable for flutes, βόμβυξ (v. Lid. and Scott, s. v.), Plin. 16, 36, 66, § 170.
bombȳcĭnus, a, um, adj. [bombyx], of silk, silken (cf. sericus): vestis, Plin. 11, 22, 26, § 76: panniculus, Juv. 6, 260: taenia, Mart. 14, 24; Dig. 34, 2, 23, § 1.
Subst.: bombȳcĭna, ōrum, n., silk garments, Mart. 11, 50, 5; 8, 68, 7; App. M. 8, p. 214, 6.
And bombȳcĭnum, i, n., a silk texture or web, Isid. Orig. 19, 22, 13.