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 adjective (SURGERY). âº specialized medical âaimed at âremoving all âdiseased âtissue: Cervical âcancer may be âcured with radical âsurgery when it is âconfined to the âpelvis or âregional âlymph ânodes. radically adverb uk us /-i/ C1 Barker âintroduced some radically new âideas.