Back focus
the distance between the back surface of a lens and the focal plane when the lens is focused at infinity.
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- Back foot
noun on the back foot, at a disadvantage; outmanoeuvred or outcl-ssed by an opponent contemporary examples government forces, he says, are constantly on the back foot, rarely launching offensives to regain territory. iraqis swear: baghdad airport is safe from isis susannah george october 12, 2014 historical examples he pulled at his back foot like a […]
- Back formation
the -n-logical creation of one word from another word that appears to be a derived or inflected form of the first by dropping the apparent affix or by modification. a word so formed, as typewrite from typewriter. historical examples in any event, the men should be taught to take some form of a closed back […]
- Back four
noun (soccer) the defensive players in many modern team formations: usually two fullbacks and two centre backs
- Back gear
(in a lathe) one of several gears for driving the headstock at various speeds. historical examples referring again to fig. 494, g′ is the pinion to drive the back gear while g receives motion from the back-gear pinion. modern machine-shop practice, volumes i and ii joshua rose various methods of moving the back gear into […]
- Back green
noun (central scot, dialect) gr-ss or a garden at the back of a house, esp a tenement historical examples crown and back green, and tail rusty tipped with dusky, no notch in tail-feathers; in other respects like no. 433. color key to north american birds frank m. chapman the window looked out on the back […]