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demi-second
demi-second n.
Brit. 
/ˈdɛmɪˌsɛk(ə)nd/
, /ˈdɛmɪˌsɛk(ə)nd/U.S. /ˈdɛmiˌsɛkənd/
/ˈdɛmiˌsɛkənd/ΚΠ
1816 W. Kirby & W. Spence Introd. Entomol. (1843) II. 248 Mr. Delisle observed a fly..which ran nearly three inches in a demi-second, and in that space made 540 steps.
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