(often in combination) Something that serves to retard (slow down) the action of something

Something which retards or slows. / (mechanical engineering) A device for slowing down large trucks, lorries, buses, shunted railway wagons.

plural of retardant

plural of retarder

(technical) A retarded person; a person with retardation.

plural of retardate

That retards; retardative.

That retards; delaying, impeditive.

Retardation; delay. / (music) A slowing down of the tempo; a ritardando. / (offensive, dated) A person with mental retardation.

(transitive) To keep delaying; to continue to hinder; to prevent from progressing. / (transitive) To put off; to postpone. / (transitive, obsolete) To be slow or dilatory to perform (something).