Prolactin is a hormone produced in the pituitary gland, named because of its role in lactation. It also has other wide ranging functions in the body, from acting on the reproductive system to influencing behaviour and regulating the immune system.
to carry or have on the body or about the person as a covering, equipment, ornament, or the like: to wear a coat; to wear a saber; to wear a disguise. to have or use on the person habitually: to wear a wig. to bear or have in one's aspect or appearance: to wear a smile; to wear an air of triumph.
Meaning: Affected by wear; damaged by long use. Context examples: worn threads on the screw / a worn suit / the worn pockets on the jacket. Similar: raddled; worn-out (used until no longer useful) moth-eaten; ratty; shabby; tatty (showing signs of wear and tear) scruffy; seedy (shabby and untidy) shopsoiled; shopworn (worn or faded from being on display in a store)