From Longman Dictionary of Contemporary Englishretractablere‧tract‧a‧ble /rɪˈtræktəbəl/ adjective FOLDa retractable part of something can be pulled back into the main part a knife with a retractable blade
Examples from the Corpus
retractable• The tailwheel was made to be retractable and a third seat was added along with a gun position.• The tail-wheel was not retractable, but could be steerable as an option.• For another $ 50 million to $ 85 million of public money, a retractable dome could be added, they said.• Short twin smoke-stacks rose from the afterdeck, but, being retractable, offered no target during combat.• a retractable razor• The new stadium will have a retractable roof.• The main stadium has a retractable roof.• It is equipped with a Grando fully retractable safety cover.• Screwdriver blades might have a retractable sheath or ultrasonic guards, for example. 