Keening

The keening stench of decay emanated from the garbage dumpster, making it difficult to pass by.

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 old television emitted a high-pitched keening noise whenever it was turned on.

The keening voices of the choir brought tears to the audience's eyes.