The Collaborative International Dictionary
Asiphonate
Asiphonate \A*si"phon*ate\, a. (Zo["o]l.) Destitute of a siphon or breathing tube; -- said of many bivalve shells. -- n. An asiphonate mollusk. [1913 Webster] ||
Wiktionary
asiphonate
a. (context zoology English) Lacking a siphon or breathing tube. n. (context zoology English) Any mollusk lacking a siphon or breathing tube.