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.
Radical means, Of or pertaining to the root; proceeding directly from the root; original ;fundamental. The current usage of the word as meaning extreme is incorrect. A radical change: a radical cure; a radical overhaul;a radical improvement, a radical difference of opinion.