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sweep second
sweep second n.
Brit. 
/ˈswiːp ˌsɛk(ə)nd/
, /ˈswiːp ˌsɛk(ə)nd/U.S. /ˈswip ˌsɛkən(d)/
(also sweep seconds, sweep seconds hand, sweep second hand) originally U.S. = centre second n. at centre n.1 and adj. Compounds 3; hence sweep-seconds watch./ˈswip ˌsɛkən(d)/ΘΚΠ
the world > time > instruments for measuring time > clock > [noun] > part(s) of > hand(s)
pinOE
hand1563
teller1574
index1594
finger1603
palm1629
hour-hand1669
minute hand1720
index-hand1742
second-hand1760
moment-hand1766
little hand1829
big hand1849
set-hands1884
sweep hand1948
sweep second1948
1948 Wrist Watches, Pocket Watches & Clocks ii. 154 Remove sweep seconds hand.
1953 W. J. Gazeley Watch & Clock Making iii. 48 Nowadays..we have what are termed sweep-seconds watches. At one time these were referred to as centre-seconds.
1962 E. Bruton Dict. Clocks & Watches 170 Sweep seconds, American name for centre seconds.
1962 J. D. MacDonald Girl viii. 101 Uncle Omar's gold watch..had an hour hand, a minute hand and a sweep second hand.
1969 Guardian 20 Aug. 7/1 All the clocks..have a sweep second hand.
1979 Sci. Amer. May 145/1 A sweep second hand on a wristwatch will also serve.
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as lemmas