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|Noun||1.||chemical group - (chemistry) two or more atoms bound together as a single unit and forming part of a molecule|
chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
building block, unit - a single undivided natural thing occurring in the composition of something else; "units of nucleic acids"
acyl, acyl group - any group or radical of the form RCO- where R is an organic group; "an example of the acyl group is the acetyl group"
alkyl, alkyl group, alkyl radical - any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons
allyl, allyl group, allyl radical - the univalent unsaturated organic radical C3H5; derived from propylene
amyl - a hydrocarbon radical that occurs in many organic compounds
molecule - (physics and chemistry) the simplest structural unit of an element or compound
carbonyl group - the bivalent radical CO
carboxyl, carboxyl group - the univalent radical -COOH; present in and characteristic of organic acids
chromophore - the chemical group that gives color to a molecule
cyanide group, cyanide radical, cyano group, cyano radical - the monovalent group -CN in a chemical compound
glyceryl - a trivalent radical derived from glycerol by removing the three hydroxyl radicals
hydroxyl, hydroxyl group, hydroxyl radical - the monovalent group -OH in such compounds as bases and some acids and alcohols
ketone group - a group having the characteristic properties of ketones
butyl - a hydrocarbon radical (C4H9)
nitro group - the group -NO3
nitrite - the radical -NO2 or any compound containing it (such as a salt or ester of nitrous acid)