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RADICAL is validvalid

a group of atoms that acts as a unit in chemical compounds [n RADICALS]

49,213 of 196,601 in NWL2023·also valid in CSW24

fundamental [adj RADICALLY] / a group of atoms behaving like a single atom and passing unchanged from one compound to another [n -S]

196,712 of 280,887 in CSW24·also valid in NWL2023