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.
The terms radical centrism, radical center (or radical centre) and radical middle refer to a political ideology that arose in the Western nations in the late 20th century. At first it was defined in a variety of ways, but at the beginning of the 21st century a number of political science texts gave it a more developed cast.