Today's Word "acuity"
Published in Vocabulary
acuity \uh-KYOO-uh-tee\ (noun) - Acuteness of perception or vision; sharpness.
"Horses tend to shy a lot because the construction of their eyes is optimized for a near 360-degree field of view, useful for spotting danger, but the price the horse pays for that is relatively poor acuity and some out-of-focus spots that can cause objects within the field of view to suddenly sail into sharp focus." -- Stephen Budiansky, 'If a Lion Could Talk'
Acuity comes from Latin acutus, "sharpened, pointed, acute," past participle of acuere, "to sharpen."
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