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 abandoned graveyard was filled with the keening of the wind passing through the tombstones.

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

The injured bird emitted a keening cry, signaling its distress.

The keening tone of his voice conveyed the depth of his heartbreak.