(dated) mental retardation

plural of retarding

(now offensive) intellectually disabled, medically defined as having an IQ (intelligence quotient) below 70 in addition to deficits in two or more adaptive behaviors (which means having problems with basic functional skills that affect everyday, general living).

Hard to ignite; not supporting or conveying flame.

A substance used to make an object flameproof.

Hard to ignite; not flammable.

A substance that makes an object resistant to burning.

Any of several substances used to delay or prevent combustion when used as a coating or component of a combustible material

(psychology, dated) A developmental disability in which the person has a very low intelligence quotient, usually below 70, plus difficulty in multiple areas of daily life. Evidence of this disability must have appeared before the person reached adulthood for diagnosis.

A layer of material or a laminate used to appreciably reduce the flow of water vapor into a roof assembly.