Prefix of the Day: ACU-

Prefix of the day:

ACU-

From Latin "acus" meaning needle. We use ACU- most frequently to mean "sharp"--like a needle.

ACUte: sharp or intense--like ACUte pain or ACUte angles: ACUte angles are sharp angles (as contrasted with obtuse angles, which are dull)

ACUity: sharpness--either of senses or objects.

ACUtance: a measure of the sharpness (clarity) of a photograph.

ACUmen: keen insight or discernment; sharpness of mind.

Mnemonic:
A porcupine has a sharp bACU know (back, you know).