What is of or pertaining to a siphon; resembling a siphon. Siphonal stomach (Zoöl.), a stomach which is tubular and bent back upon itself, like a siphon, as in the salmon called?

siphonal — Of or pertaining to a siphon; resembling a siphon. Siphonal stomach (Zoöl.), a stomach which is tubular and bent back upon itself, like a siphon, as in the salmon. (Webster's 1913.)