1) Capable of being extended 2) Extensile 3) Protractible 4) Protractile 5) Protrusible 6) Protrusile 1) Extensile 2) Protractible 3) Protractile 4) Protrusible 5) Protrusile 
• (a.) Capable of being extended, whether in length or breadth; susceptible of enlargement; extensible; extendible; -- the opposite of contractible or compressible.
(In topic `architecture`) a term synonymous with open that refers to the architectural property of openness describing the ability to add new or custom behaviours at a later date.
Ex·ten'si·ble adjective [ Confer French extensible . See Extend .] Capable of being extended, whether in length or breadth; susceptible of enlargement; extensible; extendible; -- the opposite of contractible or compressible . 'An extensible membrane' Holder....
extensible Capable of being protruded, stretched, or opened out.
capable of being extended.