Cases of word usage

1) women's pants without legs, held in position by an elastic waistband (briefs)

2) an elastic covering (to be) worn over the penis during sexual intercourse, used to prevent conception or passing on sexually transmitted diseases (condom)

3) (a band or bundle of) elastic substance in the body that can be tightened or loosened to produce movement; power (muscle)

4) a tough, elastic substance made from the milky liquid that flows from certain trees when the bark is cut, used for making tyres etc (rubber)