Definify.com
Webster 1913 Edition
Fish-tail
Fish′-tailˊ
,Adj.
Like the of a fish; acting, or producing something, like the tail of a fish.
Fish-tail burner
, a gas burner that gives a spreading flame shaped somewhat like the tail of a fish.
– Fish-tail propeller
(Steamship)
, a propeller with a single blade that oscillates like the tail of a fish when swimming.