Sextant - a navigator's instrument, so named because its arc is 60 degrees, one sixth or a circle.
sextus= sixth



Quarantine - the isolation of persons and animals carrying or suspected of carrying contagious diseases.
Figuratively, the verb quarantine means to isolate or to cut off somebody or even a nation from normal relations with society or other nations.
From french word quarante, a period of forty days.







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