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.

The lonely lighthouse emitted a keening beam of light that swept across the dark sea.

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

The haunting melody of keening echoed through the ancient ruins, commemorating the souls who had departed.

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