Plan·tain, n.  Bot. Any plant of the genus Plantago, but especially the Plantago major, a low herb with broad spreading radical leaves, and slender spikes of minute flowers.  It is a native of Europe, but now found near the abode of civilized man in nearly all parts of the world.
 Indian plantain. Bot. See under Indian.
 Mud plantain, a homely North American aquatic plant (Heteranthera reniformis), having broad, reniform leaves.
 Rattlesnake plantain, an orchidaceous plant (Goodyera pubescens), with the leaves blotched and spotted with white.
 Ribwort plantain. See Ribwort.
 Robin's plantain, the Erigeron bellidifolium, a common daisylike plant of North America.
 Water plantain, a plant of the genus Alisma, having acrid leaves, and formerly regarded as a specific against hydrophobia. --Loudon.
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 Rat·tle·snake 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.
 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.
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 rattlesnake plantain
      n : any of several small temperate and tropical orchids having
          mottled or striped leaves and spikes of small
          yellowish-white flowers in a twisted raceme [syn: helleborine]