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 ?
The Freshline[TM] tumbler freezer is designed to complement that growth by making frozen food easily portionable into individual servings.
With red meat, processors could add TG-RM to restructure the trim from steak into a portionable form, we're told.
Historically focused on catering to the needs of accomplished chefs and short order cooks alike, the company's creative cuisine offerings make it easy for them to control costs with portionable frozen fare.