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A clock face or instrument resembling a clock face.
[L. dies, day]


a circular diagram with black lines radiating outward across a white background from the center, as is used in tests of astigmatism.


(dī′ăl) [L. dialis, daily, fr. dies, day]
A graduated circular face, similar to a clock face, on which some measurement is indicated by a pointer that moves as the entity being measured (pressure, temperature, or heat) changes.

astigmatic dial

A circular dial with black lines of uniform width drawn as if they were connecting opposing numbers on the face of a clock. It is used in testing for astigmatism.
References in periodicals archive ?
A business need only make a telephone call (on a rotary dial phone) to file electronically.
Often called rotary dial machines, these machines offer a compact footprint and handle a wide variety of machining jobs in both smaller and larger components for the automotive, appliance, aerospace, and job shop industries.
Keep gear safely locked up with Master Lock's 1-7/8-inch-wide padlock (1530DPNK) which offers a pink twist on the familiar rotary dial combination lock most people grew up with.
The interior, too, is cool and chic, with simple rotary dial controls, three-spoke multi-function steering wheel and neat and logical binnacle layout - and touchscreen for major functions like connectivity, navigation and infotainment.
It will only be available with an automatic transmission, coupled with a rotary dial gear selector, similar to Jaguar's design.
There are hideous '70s outfits, and pratfalls, and a running gag about rotary dial telephones.
NQH Transfer Case, Electronic Auto Trac with Rotary Dial Control _____ ______
A rotary dial controls the automatic transmission - one of a number of neat touches helping to justify the pounds 67,500 price tag.
For ease of use, a rotary dial clearly indicates which function is selected, and provides access to all functions in one place to avoid complex multi-level menus, so that even after a long period of non-use the Fluke 1650B remains intuitive to use.
A rotary dial with a built-in push button brews crema coffee, espresso, cappuccino, latte and ristretto.
You even get a lovely whirring sound with the old-fashioned rotary dial.
Say goodbye to straight forward clicking - here's a mouse with a rotary dial that swivels when you move your finger.