noun which may take the genitive case particle 'no', noun
Describes something designed to be pulled in or drawn back, such as a tape measure, landing gear, or cord. Often used as a no-adjective modifying a noun.
This vacuum cleaner has a retractable cord.
The plane's retractable landing gear was stowed.
Compound of 引き込み (pulling in) + 式 (style/type). The exact historical derivation is uncertain, but the components transparently combine to mean 'retractable type'.