Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Branchus, i, m., = Βράγχος, a son of Apollo; or, according to others, of Smicrus of Delphi, inspired by Apollo with prophecy, v. Branchidae, Stat. Th. 3, 479; 8, 198 Schol.