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Foveola

Noun, pl. foveolas or foveolae or foveolæ

(Anatomy)
1. The center of the fovea in the macula of the eye, approximately 0.35 mm in diameter, containing only cone cells. (wiktionary.org)

2. A yellowish, cone photo receptor filled portion of the human retina located within a region called the macula. 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. (wikipedia.org)

Word origin: Latin word meaning a little pit (diminutive of Latin fovea).