Etymology
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sinew (n.)

Old English seonowe, oblique form of nominative sionu "sinew," from Proto-Germanic *sinwō (source also of Old Saxon sinewa, Old Norse sina, Old Frisian sine, Middle Dutch senuwe, Dutch zenuw, Old High German senawa, German Sehne), from PIE root *sai- "to tie, bind" (source also of Sanskrit snavah "sinew," syati, sinati "to bind;" Avestan snavar, Irish sin "chain;" Hittite ishai-/ishi- "to bind").

updated on August 01, 2018

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Definitions of sinew from WordNet

sinew (n.)
a cord or band of inelastic tissue connecting a muscle with its bony attachment;
Synonyms: tendon
sinew (n.)
possessing muscular strength;
Synonyms: brawn / brawniness / muscle / muscularity / heftiness
From wordnet.princeton.edu, not affiliated with etymonline.