Mitten

The little boy lost a mitten playing in the snow.

Glittens are fingerless gloves with a mitten.

I lost my mitten.

This fits like a mitten, not a glove, because it is a mitten.

A mitten is a glove shaped to separate only the thumb from the remaining four fingers.

A mitten is a glove shaped to separate only the thumb, and not the remaining four fingers.

Tom lost his mitten.

to give someone the mitten; to get the mitten

He mittened his hand and beat it violently for a minute before exposing it to the frost to strike a match.