re·trac·tile /rɪˈtræktḷ, ˌtaɪl/
(a.)伸縮自如的,縮回的,收縮的
re·trac·tile /rɪˈtræktḷ, ˌtaɪl/ 形容詞
可退縮的,可縮回的
Re·tract·ile a. Physiol. Capable of retraction; capable of being drawn back or up; as, the claws of a cat are retractile.
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retractile
adj : capable of retraction; capable of being drawn back; "cats
have retractile claws" [ant: nonretractile]