1 molecule | Definition of molecule

molecule

noun
mol·​e·​cule | \ ˈmä-li-ËŒkyül How to pronounce molecule (audio) \

Definition of molecule

1 : the smallest particle of a substance that retains all the properties (see property sense 1a) of the substance and is composed of one or more atoms (see atom sense 1a) a molecule of water a molecule of oxygen
2 : a tiny bit : particle a molecule of political honestyTime

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Examples of molecule in a Sentence

There is not a molecule of evidence to support these charges. not a molecule of sense in that girl

Recent Examples on the Web

Gradual changes, in every direction At least since Darwin, though, scientists’ idea of the world is organized through transitions – from inanimate molecules to life, from earlier organisms to different kinds of plants and animals, and so on. Antonio G. Valdecasas, The Conversation, "Evolution doesn’t proceed in a straight line – so why draw it that way?," 3 Sep. 2019 His team would see how quickly Insilico’s AI could identify new molecules that bind with a protein associated with tissue scarring. Wired, "A Molecule Designed By AI Exhibits 'Druglike' Qualities," 2 Sep. 2019 This is a step toward molecular propellers that can act more like gears, interacting with nearby molecules to create a chain of movement. Scientific American, "Nanomachines, Jellyfish Hugs and Hurricane Dorian From Space: The Week's Best Science GIFs," 30 Aug. 2019 This happens when fructose molecules burn at around 230º F, creating undertones of caramel or butterscotch. Jeff Csatari, Popular Mechanics, "The Ultimate Grilling Guide," 30 Aug. 2019 This network of receptors, enzymes and other molecules is thought by some to help regulate just about every physiological system in the body. Shari Rudavsky, Indianapolis Star, "Weed 101: Three Indiana women want to teach doctors about medical cannabis," 29 Aug. 2019 Within the plant are chemicals called cannabinoids, similar to molecules produced by the human body, known as endocannabinoids. The Economist, "A global revolution in attitudes towards cannabis is under way," 29 Aug. 2019 The amount of caffeine that can be extracted largely depends on how forcefully the solvents can pull those caffeine molecules out, Ristenpart explains. Carolyn L. Todd, SELF, "Turns Out Decaf Coffee Has Caffeine, Which Feels Like a Betrayal," 29 Aug. 2019 Saturation refers to how the fatty acid’s carbon molecules connect with each other. Environmental Nutrition, sun-sentinel.com, "How to choose the best oil for you," 28 Aug. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'molecule.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of molecule

1701, in the meaning defined at sense 1

History and Etymology for molecule

French molécule, from New Latin molecula, diminutive of Latin moles mass

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More Definitions for molecule

molecule

noun

English Language Learners Definition of molecule

: the smallest possible amount of a particular substance that has all the characteristics of that substance
: a very small amount of something

molecule

noun
mol·​e·​cule | \ ˈmä-li-ËŒkyül How to pronounce molecule (audio) \

Kids Definition of molecule

: the smallest portion of a substance having the properties of the substance a molecule of water

molecule

noun
mol·​e·​cule | \ ˈmäl-i-ËŒkyü(É™)l How to pronounce molecule (audio) \

Medical Definition of molecule

: the smallest particle of a substance that retains all the properties of the substance and is composed of one or more atoms

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