
1) Human eye anatomy
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https://www.crosswordclues.com/clue/foveola

The foveola is located within a region called the macula, a yellowish, cone photo receptor filled portion of the human retina. The foveola is approximately 0.35 mm in diameter and lies in the center of the fovea and contains only cone cells, and a cone-shaped zone of Müller cells. In this region the cone receptors are found to be longer, slimmer ...
Found on
http://en.wikipedia.org/wiki/Foveola

• (n.) A small depression or pit; a fovea.
Found on
http://thinkexist.com/dictionary/meaning/foveola/

(pl
Found on
http://www.earthlife.net/insects/glossary.html

central region of the fovea which contains only cones NOTE - The foveola subtends an angle of about 0.017 rad (1°) in the visual field.
Found on
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=845-02-06

A minute fovea or pit. ... Origin: Mod. L. Dim. Of L. Fovea, pit ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973

(fo-ve´o-lә) pl. fove´olae Latin word meaning a small pit or depression; a term used in anatomy.
Found on
http://www.encyclo.co.uk/local/21001
Fo·ve'o·la noun ;
plural Foveolæ . [ New Latin , dim. of Latin
fovea .] A small depression or pit; a fovea.
Found on
http://www.encyclo.co.uk/webster/F/70

Type: Term Pronunciation: fō-vē′ō-lă, -lē Definitions: 1. A minute fovea or pit.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=35240

foveola (s) (foh VEE oh luh), foveolae (pl) (foh VEE oh lee) A very small, or minute, pit or depression.
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http://www.wordinfo.info/words/index/info/view_unit/852/

diminutive of fovea.
Found on
https://www.encyclo.co.uk/local/21450

a small fovea; a very small pit or depression.
Found on
https://www.infoplease.com/dictionary/foveola
No exact match found.