If you have allergies, pregnancy can make your symptoms worse. But you're right to worry about taking allergy medicine during pregnancy. Pregnant women shouldn't take some allergy drugs. Certain antihistamines, however, are safe.
free radical. (chemistry). An atom or a diatomic or polyatomic molecule which possesses one unpaired electron. Also known as a radical.ree radical. in chemistry, a molecule or atom that contains an unpaired electron but is neither positively nor negatively charged. Free radicals are usually highly reactive and unstable.
Solving Radical Equations: Introduction (page 1 of 6) A radical equation is an equation in which at least one variable expression is stuck inside a radical, usually a square root. For instance, this is a radical equation: ...but this is not: The radical in radical equations can be any root, whether a square root, a cube root, or some other root.