h₂eḱ-u-

“swift, quick, sharp”

Widely acceptedspeedsharpness

Source of Latin acus, acuere, English acute, acuity

Adjectival form of the sharp root, yielding Latin acuere and English acute, acuity, acupuncture.‌‍‌‍‌‌‌‌‌‌‍‍‍‌‍‌‌‍‍‌‌‍‌‌‌‍‌‍‌‍‍‌

dreh₂-“to run, to move quickly”h₃eḱ-“to be swift, sharp”h₂eḱ-men-₂“sharpness, point of stone”h₂eḱ-men-₃“stone tool, sharp implement”h₃eḱ-mn̥“swift motion, eye”h₂eḱ-mn̥-₂“edge, blade, sharp line”h₂eḱ-r-“sharp point, summit”h₂eḱ-s-“to sharpen (extended with -s)”