For the noun: tobacco
Plural form: tobaccos, tobaccoes

WordReference Random House Learner's Dictionary of American English © 2017
to•bac•co /təˈbækoʊ/USA pronunciation   n., pl.  -cos, -coes. 
  1. Plant Biology[uncountable] a plant of the nightshade family whose leaves are prepared for smoking.
  2. the prepared leaves of this plant, as used in cigarettes, cigars, and pipes: [uncountable]The smell of tobacco hung in the room.[countable]different tobaccos for different blends.
to•bac•co•less, adj. 

WordReference Random House Unabridged Dictionary of American English © 2017
to•bac•co  (tə bakō),USA pronunciation n., pl.  -cos, -coes. 
  1. Plant Biologyany of several plants belonging to the genus Nicotiana, of the nightshade family, esp. one of those species, as N. tabacum, whose leaves are prepared for smoking or chewing or as snuff.
  2. the prepared leaves, as used in cigarettes, cigars, and pipes.
  3. any product or products made from such leaves.
  4. Plant Biologyany of various similar plants of other genera.
to•bacco•less, adj. 
  • Arawak: a pipe for smoking the plant, or roll of leaves smoked, or the plant
  • Spanish tabaco, perh.
  • 1525–35

Collins Concise English Dictionary © HarperCollins Publishers::

tobacco /təˈbækəʊ/ n ( pl -cos, -coes)
  1. any of numerous solanaceous plants of the genus Nicotiana, having mildly narcotic properties, tapering hairy leaves, and tubular or funnel-shaped fragrant flowers. The species N. tabacum is cultivated as the chief source of commercial tobacco
  2. the leaves of certain of these plants dried and prepared for snuff, chewing, or smoking
Etymology: 16th Century: from Spanish tabaco, perhaps from Taino: leaves rolled for smoking, assumed by the Spaniards to be the name of the plant

toˈbaccoless adj

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