the condition of being ignorant; the want of knowledge in general, or in relation to a particular subject; the state of being uneducated or uninformed. Ignorance (noun). a willful neglect or refusal to acquire knowledge which one may acquire and it is his duty to have. Origin: [F., fr.
Monoamine oxidase inhibitors (MAOIs) are a class of medication used to treat depression. They were introduced in the 1950s as the first drugs for depression. Today, theyâre less popular than other depression medications, but some people benefit from their use.
Called also MAO. monoamine oxidase inhibitors. substances that inhibit the activity of monoamine oxidase, increasing catecholamine and serotonin levels in the brain; they are used as antidepressants and antihypertensives. Called also MAO inhibitors.n amine containing only one amino group. monoamine oxidase (MAO) a copper-containing enzyme that deaminates monoamines such as dopamine, epinephrine, norepinephrine, and serotonin. See also monoamine oxidase inhibitor.