portion

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por·tion

(pōr'shŭn),
Part or division.
Farlex Partner Medical Dictionary © Farlex 2012

por·tion

(pōr'shŭn)
Part or division.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

segment of a bifocal lens (seg) 

An area of a bifocal lens of a power different to that of the main portion. Syn. portion. There is the distance portion, which has the correction for distance vision, and the near or reading portion, which has the correction for near vision. See intermediate portion.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
These testify to all concerned at the desire of William Adam portioner of Slachristock that the said William Adam attends upon public worship upon the Lord's day ordinarily, and for the most parts upon diets of catechising, being catechized by me then with his neighbours, according to his capacity.
"Hand labor is bacteria-ridden, and moving product through more efficiently and getting it into the freezer is probably the single biggest issue," says Tim Loveall, president of S&P Meats in Spokane, Wash., another DSI Waterjet Portioner user.
The I-Slice 1068VA automatic portioner from Marel automatically and accurately portions thin, flat meat to fixed weight.
The company has increased the capacity of the skin dicer portioner to handle larger blocks -- up to eight inches thick, 24 inches wide and 30 inches long.
A partial list of equipment available includes a 16-inch coating and frying line, a spiral oven, a jet stream oven, a DSI Waterjet Portioner, and spiral-belt and liquid nitrogen tunnels.
To set up the new production line, from mincer and portioner to packaging machine and materials, the company turned to Convenience Food Systems (CFS), Bakel, the Netherlands, which offered one-stop shopping and other advantages.
The automation comes in the form of the Portioner from DSI, Redmond, Wash.