1858 Mayne Expos. Lex. (Siphonanthous, Siphonapterous). 
1895 Funk's Stand. Dict. 
siphon-
combining form 
or siphono- also siphoni-
Etymology: New Latin, from Greek siphōn-, siphōno-, from siphōn 
1. : siphon : tube : pipe 
< Siphonaptera >
< Siphonophora >
< Siphoniata >
< siphonate >
2. : Siphonophora 
< siphonosome >
< siphonozooid >
or siphono- also siphoni-
1.
< Siphonaptera >
< Siphonophora >
< Siphoniata >
< siphonate >
2.
< siphonosome >
< siphonozooid >