Ember (noun)

1. A live coal or smoldering fragment from a fire.
2. A small, glowing piece of coal or wood in a dying fire.
3. A small, hot, glowing piece of material left after a larger piece burns.

Origin:

Middle english embre, from old english æmerge; akin to old high german amar- firebrand, latin ambāre to glow, greek embolē spark.

Examples:

1. He used a pair of tongs to carefully place the embers in the new fire.
2. The ashes and embers of the campfire were still warm.
3. The embers in the fireplace had died down to a soft glow.
4. The ember glowed red as she blew on it to start the fire.
5. The embers in the fire pit smoldered all night long.