·noun A shrill sound.
II. Shrill ·vt To utter or express in a shrill tone; to cause to make a shrill sound.
III. Shrill ·vi To utter an acute, piercing sound; to sound with a sharp, shrill tone; to become shrill.
IV. Shrill ·vi Acute; sharp; piercing; having or emitting a sharp, piercing tone or sound;
— said of a sound, or of that which produces a sound.