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.
A radical (bushu) is a common sub-element found in different kanji characters. Every kanji has a radical or a radical itself can be a kanji. Radicals express the general nature of the kanji characters.A radical is the part of the kanji character that gives you a clue to its origin, group, meaning or pronunciation.Many kanji dictionaries organize characters by their radicals.There are 214 radicals.adicals express the general nature of the kanji characters. A radical is the part of the kanji character that gives you a clue to its origin, group, meaning or pronunciation. Many kanji dictionaries organize characters by their radicals. There are 214 radicals.