Source : Webster's Revised Unabridged Dictionary (1913)

Spittle \Spit"tle\, n. [From {Spit} to eject from the mouth: cf.
   {Spattle}, and AS. sp[=a]tl.]
   The thick, moist matter which is secreted by the salivary
   glands; saliva; spit.

   {Spittle insect}. (Zo["o]l.) See {Cuckoo spit}
   (b), under {Cuckoo}.

Source : WordNet®

spittle insect
     n : small leaping herbivorous insect that lives in a mass of
         protective froth which it and its larvae secrete [syn: {spittlebug}]