"an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby mo"
"a person who has radical ideas or opinions"
"a character conveying the lexical meaning of a logogram"
"markedly new or introducing radical change"
"arising from or going to the root or source"
"of or relating to or constituting a linguistic root"
"especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem"