The Collaborative International Dictionary
Syngnathous
Syngnathi \Syng"na*thi\, n. pl. [NL., fr. Gr. sy`n with + ? jaw.] (Zo["o]l.) A suborder of lophobranch fishes which have an elongated snout and lack the ventral and first dorsal fins. The pipefishes and sea horses are examples. -- Syng"na*thous, a.
Wiktionary
syngnathous
a. (context zoology English) Relating to the Syngnathi.