Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† bombax, interj., = βομβάξ (v. Eustath. Od. p. 1718, a), an exclamation of real or affected surprise, indeed! strange! Ca. Fur. Ba. Babae. Ps. Fugitive. Ba. Bombax, Plaut. Ps. 1, 3, 131 Lambin.