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plural molecules or moleculae or moleculæ
(chemistry) The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; two or more atoms held together by chemical bonds. quotations examples
The critical component of the photosynthetic system is the “water-oxidizing complex”, made up of manganese atoms and a calcium atom. This system splits water molecules and delivers some of their electrons to other molecules that help build up carbohydrates.
2013 September-October, Katie L. Burke, “In the News”, in American Scientist, Sigma Xi, archived from the original on 3 September 2013
A tiny amount. examples