protractile

adj.

（身体部位等）能伸出的，可延长的；

Protractile electric tombstone toy
The protractile apparatus of the mouth of the catastomid fishes
An adaptive series of protractile jaws in Cichlid fishes
The protractile apparatus of the mouth of the pumpkinseed sunfish, Eupomotis gibbosus L
Contractile and protractile coordination within an actin filament sliding on myosin molecules
Prevalence of inverted and non-protractile nipples in antenatal women who intend to breast-feed
Transition from contractile to protractile distortions occurring along an actin filament sliding on myosin molecules
Preparing for breast feeding: treatment of inverted and non-protractile nipples in pregnancy ☆
The prevalence and management of inverted and non-protractile nipples in antenatal women who intend to breastfeed.
Randomised controlled trial of breast shells and Hoffman's exercises for inverted and non-protractile nipples