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| any of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals |
| a highly concentrated, aqueous solution of potassium hydroxide or sodium hydroxide, or any solution resulting from leaching or percolation |
| acyl group | |
noun | |
| any group or radical of the form RCO- where R is an organic group; "an example of the acyl group is the acetyl group" [syn: acyl] |