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back staff
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noun
an obsolete instrument for determining the altitude of the sun by facing away from the sun, sighting upon the horizon, adjusting a cursor until its shadow falls upon the sight through which the horizon appears, and measuring the resulting arc.
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Which of the following nouns has an irregular plural form?
Origin of back staff
First recorded in 1620–30
Words nearby back staff
backspin, backsplash, backsplice, backstab, back-stabbing, back staff, backstage, backstairs, backstay, backstitch, backstop
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022