An Etymological Dictionary of Astronomy and Astrophysics

Sharpness; acuteness; keenness of perception.

Etymology (EN): M.E., from M.Fr. acuité, from M.L. acuitatem (nom. acuitas) “sharpness,” from L. acus “needle,” acuere “to sharpen,” from PIE root *ak- “be sharp.”

Etymology (PE): Tiznâ “sharpness,” from tiz, “→ sharp,”

• -nâ, a suffix that transforms adjective into noun (compare with tangnâ, derâznâ, farâxnâ, etc.).