[1] : The Collaborative International Dictionary of English v.0.48

rattlesnake \rat"tlesnake`\ ra^t"t'lsn=ak`, n. zool.
   any one of several species of venomous american snakes
   belonging to the genera crotalus and caudisona, or
   sistrurus; sometimes also called rattler. they have a
   series of horny interlocking joints at the end of the tail
   which make a sharp rattling sound when shaken. the common
   rattlesnake of the northern united states crotalus
   horridus, and the diamondback rattlesnake also called
   diamondback rattler, and diamondback of the south and
   east crotalus adamanteus and west crotalus atrox, are
   the best known. see illust. of fang.
   1913 webster +pjc

   ground rattlesnake zool., a small rattlesnake caudisona
      miliaria or sistrurus miliaria of the southern united
      states, having a small rattle. it has nine large scales on
      its head.

   rattlesnake fern bot., a common american fern
      botrychium virginianum having a triangular decompound
      frond and a long-stalked panicle of spore cases rising
      from the middle of the frond.

   rattlesnake grass bot., a handsome american grass
      glyceria canadensis with an ample panicle of rather
      large ovate spikelets, each one composed of imbricated
      parts and slightly resembling the rattle of the
      rattlesnake. sometimes called quaking grass.

   rattlesnake plantain bot., see under plantain.

   rattlesnake root bot., a name given to certain american
      species of the composite genus prenanthes prenanthes
      alba and prenanthes serpentaria, formerly asserted to
      cure the bite of the rattlesnake. called also lion's
      foot, gall of the earth, and white lettuce.

   rattlesnake's master bot.
   a a species of agave agave virginica growing in the
       southern united states.
   b an umbelliferous plant eryngium yuccaefolium with
       large bristly-fringed linear leaves.
   c a composite plant, the blazing star liatris
       squarrosa.

   rattlesnake weed bot., a plant of the composite genus
      hieracium hieracium venosum; -- probably so named
      from its spotted leaves. see also snakeroot.
      1913 webster
see also:
crotalus caudisona sistrurus rattler crotalus horridus diamondback rattlesnake 
diamondback rattler diamondback crotalus adamanteus crotalus atrox fang 
ground rattlesnake caudisona miliaria sistrurus miliaria rattlesnake fern botrychium virginianum 
rattlesnake grass glyceria canadensis quaking grass rattlesnake plantain plantain 
rattlesnake root prenanthes prenanthes alba prenanthes serpentaria lion's foot 
gall of the earth white lettuce rattlesnake's master agave virginica eryngium yuccaefolium 
liatris squarrosa rattlesnake weed hieracium hieracium venosum snakeroot 

[2] : WordNet (r) 2.0

diamondback rattlesnake
     n : large deadly rattlesnake with diamond-shaped markings syn:
         diamondback, crotalus adamanteus
see also:
diamondback crotalus adamanteus 

Rattlesnake >> R Words
Rattlesnake, definition of term: Rattlesnake
rattlesnake_pag1.html

Diamondback >> D Words
Diamondback, definition of term: Diamondback
diamondback_pag1.html