Keening

The keening whistle of the tea kettle signaled that the water had boiled.

The keening whistle of the teapot signaled that the water was boiling.

As the fog rolled in, a keening foghorn warned ships of the treacherous rocks ahead.

The keening aroma of freshly baked bread wafted through the bakery.

The character in the horror movie let out a keening scream that sent chills down the audience's spine.

The scientist dedicated countless hours to research, driven by a keening curiosity to unlock the mysteries of the universe.