To wind, turn. European root.
1. strepto-, strop, strophe, strophoid, strophulus; anastrophe, apostrophe1, boustrophedon, catastrophe, diastrophism, from Greek strephein, to wind, turn, twist, with o-grade derivatives strophē, a turning, and strophion, headband.
2. Unaspirated o-grade form *strob-. strobilus; stroboscope, from Greek strobos, a whirling, whirlwind.
3. Unaspirated zero-grade form *str̥b-. strabismus, strabotomy, from Greek strabos, squinting.
[In Pokorny 1. (s)ter- 1022.]

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Universalium. 2010.