The Collaborative International Dictionary of English v.0.48:

Flea \Flea\ (fl[=e]), v. t. [See Flay.]
   To flay. [Obs.]
   [1913 Webster]

         He will be fleaed first
         And horse collars made of's skin.        --J. Fletcher.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Flea \Flea\, n. [OE. fle, flee, AS. fle['a], fle['a]h; akin to
   D. vtoo, OHG. fl[=o]h, G. floh, Icel. fl[=o], Russ. blocha;
   prob. from the root of E. flee. [root]84. See Flee.]
   (Zool.)
   An insect belonging to the genus Pulex, of the order
   Aphaniptera. Fleas are destitute of wings, but have the
   power of leaping energetically. The bite is poisonous to most
   persons. The human flea (Pulex irritans), abundant in
   Europe, is rare in America, where the dog flea
   (Ctenocephalides canis, formerly Pulex canis) and the
   smaller cat flea (Ctenocephalides felis) take its place.
   See Aphaniptera, and Dog flea. See Illustration in
   Appendix.
   [1913 Webster]

   A flea in the ear, an unwelcome hint or unexpected reply,
      annoying like a flea; an irritating repulse; as, to put a
      flea in one's ear; to go away with a flea in one's ear.

   Beach flea, Black flea, etc. See under Beach, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

flea
    n 1: any wingless bloodsucking parasitic insect noted for
         ability to leap

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "flea":
   broad jumper, bucking bronco, buckjumper, cat flea, chigoe,
   cockroach, crab, dog flea, frog, gazelle, goat, grasshopper,
   grayback, high jumper, hopper, hurdle racer, hurdler, jackrabbit,
   jigger, jumper, jumping bean, jumping jack, kangaroo, leaper,
   louse, mite, nit, parasite, pole vaulter, red bug, roach, salmon,
   sand flea, stag, sunfisher, timber topper, vaulter, vermin,
   weevil



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

FLEA
       Four Letter Extended Acronym


Easton's 1897 Bible Dictionary:

Flea
   David at the cave of Adullam thus addressed his persecutor Saul
   (1 Sam. 24:14): "After whom is the king of Israel come out?
   after whom dost thou pursue? after a dead dog, after a flea?" He
   thus speaks of himself as the poor, contemptible object of the
   monarch's pursuit, a "worthy object truly for an expedition of
   the king of Israel with his picked troops!" This insect is in
   Eastern language the popular emblem of insignificance. In 1 Sam.
   26:20 the LXX. read "come out to seek my life" instead of "to
   seek a flea."