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Origin of fiducial
OTHER WORDS FROM fiducialfi·du·cial·ly, adverbun·fi·du·cial, adjective
Words nearby fiducial
How to use fiducial in a sentence
The cistern should not, however, require adjustment to a zero or fiducial point.A Treatise on Meteorological Instruments|Henry Negretti
When the mouth is adjusted to the lower fiducial line, the scale is exact.
It gives, in short, the average tint of every unit of area in the picture, measured from the fiducial lines as co-ordinates.
It is upon this focusing-screen in the roof that I see the fiducial lines by which I make all the adjustments.
As regards the fiducial lines, they might be drawn on the glass screen; but black lines are not, I find, the best.