American Heritage Dictionary
(1)
Century Dictionary
(15)
GNU Webster's 1913
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WordNet
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Elsewhere on the web
As for parallax, the scope was an American model Zeiss 4. 5X-14X with dial-a-dog parallax on the turret, so that was not the problem.— Field & Stream -
They were as much puzzled about the meaning of the word parallax as I had been with regard to the word algebra, and only learnt what it meant when Brewster went to study for the kirk in Edinburgh.— Personal Recollections, from Early Life to Old Age, of Mary Somerville
This, then, is parallax, and, compounded with invisibility at Paris, is great parallax--or that, in the course of a month, in the summer of 1762, a large, opaque, spindle-shaped body traversed the disk of the sun, but at a great distance from the sun.— The Book of the Damned
But the parallax was considerable.— The Book of the Damned
To this I may safely say, that hee may justly be accounted a weake Mathematician who mistrusts the strength of this argument, nor can hee know much in Astronomy, who understands not the parallax, which is the foundation of that Science, and I am sure that hee is a timorous man, who dares not believe the frequent experience of his senses, or trust to a demonstration Sidenote 1*: Epist.— The Discovery of a World in the Moone Or, A Discovrse Tending To Prove That 'Tis Probable There May Be Another Habitable World In That Planet

American Heritage Dictionary (1)
Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a year.
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