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 traditional keening at the Irish wake added an emotional element to the farewell ceremony.

The widow sat alone in her empty house, keening softly for the husband she had lost.

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