Note: The edible frog of Europe ({Rana esculenta}) is
extensively used as food; the American bullfrog ({R.
Catesbiana}) is remarkable for its great size and loud
voice.
2. [Perh. akin to E. fork, cf. frush frog of a horse.]
(Anat.) The triangular prominence of the hoof, in the
middle of the sole of the foot of the horse, and other
animals; the fourchette.
3. (Railroads) A supporting plate having raised ribs that
form continuations of the rails, to guide the wheels where
one track branches from another or crosses it.
4. [Cf. fraco of wool or silk, L. floccus, E. frock.] An
oblong cloak button, covered with netted thread, and
fastening into a loop instead of a button hole.
5. The loop of the scabbard of a bayonet or sword.
{Cross frog} (Railroads), a frog adapted for tracks that
cross at right angles.
{Frog cheese}, a popular name for a large puffball.
{Frog eater}, one who eats frogs; -- a term of contempt
applied to a Frenchman by the vulgar class of English.
{Frog fly}. (Zo["o]l.) See {Frog} hopper.
{Frog hopper} (Zo["o]l.), a small, leaping, hemipterous
insect living on plants. The larv[ae] are inclosed in a
frothy liquid called {cuckoo spit} or {frog spit}.
{Frog lily} (Bot.), the yellow water lily ({Nuphar}).
{Frog spit} (Zo["o]l.), the frothy exudation of the {frog
hopper}; -- called also {frog spittle}. See {Cuckoo spit},
under {Cuckoo}.