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noun 
  1. in chemistry, the smallest particle of a specific element or compound that retains the chemical properties of that element or compound; a group of atoms held together by chemical bonds
  2. a tiny amount
Etymology: w:French language, French molécule (1674, w:Pierre Le Gallois, Pierre Le Gallois, Conversations tirées de l'Académie de M. l'abbé Bourdelot, contenant diverses recherches et observations physiques) cited in Quemada, Brenard (1965), Datations et documents lexicographiques (tome 3).w:Latin language, Medieval Latin molecula (early XVI cent., w:Pierre Gassendi, Pierre Gassendi), cited in Le Grand Robert de la Langue Franíaise (2e édn) tome 6. ISBN 2-85036-094-5. pp. 522"23. Diminutive of moles

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