1 [moh-ler]
Also called molar tooth. a tooth having a broad biting surface adapted for grinding, being one of twelve in humans, with three on each side of the upper and lower jaws. See illus. under tooth.
adapted for grinding, as teeth.
pertaining to such teeth.

1535–45; < Latin molāris grinder, short for (dēns) molāris grinding (tooth), equivalent to mol(a) millstone + -āris -ar1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
molar1 (ˈməʊlə)
1.  any of the 12 broad-faced grinding teeth in man
2.  a corresponding tooth in other mammals
3.  of, relating to, or designating any of these teeth
4.  used for or capable of grinding
[C16: from Latin molāris for grinding, from mola millstone]

molar2 (ˈməʊlə)
1.  (of a physical quantity) per unit amount of substance: molar volume
2.  (not recommended in technical usage) (of a solution) containing one mole of solute per litre of solution
[C19: from Latin mōlēs a mass]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"grinding tooth," 1540s, from L. molaris dens "grinding tooth," from mola "millstone," from PIE base *mel- "to rub, grind" (see mill (1)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

molar mo·lar1 (mō'lər)

  1. Relating to or being a solution that contains one mole of solute per liter of solution.

  2. Of, relating to, or characterizing the physical properties of a body of matter as a whole, especially the mass of a body, as opposed to the molecular or atomic properties.

  3. Abbr. M Of, relating to, or being a solution whose concentration is expressed as moles of solute per liter of solution.

  4. Containing one mole of a substance.

molar 2
A tooth having a crown with three, four, or five cusps on the grinding surface, a bifid root in the lower jaw, and three conical roots in the upper jaw. In permanent dentition, there are three on either side behind the premolars; in deciduous dentition, there are two on either side behind the canines. adj.

  1. Of or relating to the molars.

  2. Capable of grinding.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
molar 1   (mō'lər)  Pronunciation Key 
  1. Relating to a mole.

  2. Containing one mole of solute per liter of solution.

molar 2   (mō'lər)  Pronunciation Key 
Any of the teeth located toward the back of the jaws, having broad crowns for grinding food. Adult humans have 12 molars.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
molars [(moh-luhrz)]

The teeth with broad surfaces at the back of the mouth that serve to grind food. Including the wisdom teeth, adults have twelve molars — six on the top and six on the bottom. (Compare incisors and canines.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
They also looked at similar chemistry in a few of the skeletons' molars.
Plus he broke the bridge on his molars the first night out while chewing up one
  of the lollipops he'd brought along for energy.
Sauropods did not have robust batteries of molars to chew their food.
The team, seen inset surrounding the tusks, also uncovered some of the animal's
  leg bones and parts of a jaw with molars.
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