/ ɪˈlæstɪk; NAmE / noun , adjective
■ noun
[ U ] material made with rubber, that can stretch and then return to its original size :
This skirt needs some new elastic in the waist.
■ adjective
1.
made with elastic :
an elastic headband
2.
able to stretch and return to its original size and shape :
elastic materials
3.
that can change or be changed :
Our plans are fairly elastic.
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WORD ORIGIN
mid 17th cent. (originally describing a gas in the sense expanding spontaneously to fill the available space ): from modern Latin elasticus , from Greek elastikos propulsive, from elaunein to drive.