semiflexible

adjective
semi·​flex·​i·​ble | \ ˌse-mē-ˈflek-sə-bəl How to pronounce semiflexible (audio) , ˌse-ˌmī-, -mi-\

Definition of semiflexible

1 : somewhat flexible
2 of a book cover : having a thin board stiffener under the covering material

First Known Use of semiflexible

1925, in the meaning defined at sense 1

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