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semi·flex·i·ble | \ ˌse-mē-ˈflek-sə-bəl 
, ˌse-ˌmī-, -mi- \
, ˌse-ˌmī-, -mi- \Definition of semiflexible
1 : somewhat flexible
2 of a book cover : having a thin board stiffener under the covering material
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The first known use of semiflexible was in 1925
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