A substance that makes an object resistant to burning.

Hard to ignite; not supporting or conveying flame.

A substance used to make an object flameproof.

(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.

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

plural of vapor retarder

(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).

The salinity gradient energy retrieved from the difference in the salt concentration between seawater and river water.