(dated) mental retardation

plural of retarding

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.

(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).

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

plural of fire retardant

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