The Collaborative International Dictionary
Siphonobranchiate
Siphonobranchiate \Si`pho*no*bran"chi*ate\, a. (Zo["o]l.) Having a siphon, or siphons, to convey water to the gills; belonging or pertaining to the Siphonobranchiata. -- n. One of the Siphonobranchiata.
Wiktionary
siphonobranchiate
a. (context zoology English) Having a siphon or siphons to convey water to the gills; belonging or relating to the Siphonobranchiata.