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 old haunted house echoed with the keening cries of unseen spirits.

The patient lay in the hospital bed, his keening thoughts consumed by the desire to be healthy again.

The mourners joined in a collective keening, their voices blending in a sorrowful chorus that echoed through the valley.