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arcus senilis

American  
[ahr-kuhs suh-nahy-lis] / ˈɑr kəs səˈnaɪ lɪs /

noun

Ophthalmology.

  1. the appearance of a yellowish-gray lipid ring around the margin of the cornea, occurring in aging persons.

arcus senilis British  
/ ˈɑːkəs sɪˈnaɪlɪs /

noun

  1. an opaque circle around the cornea of the eye, often seen in elderly people

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of arcus senilis

First recorded in 1785–95, arcus senilis is from Latin arcus senīlis literally, “old man's bow”

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.