Definition of "cinder"

Travellers over the London & North Western main line in bygone days will need no reminder of the pattering of cinders on the carriage roofs, the fountains of sparks from the chimneys at night and the distance from which the exhaust of approaching locomotives could be heard, due to the fierceness of their blast in such conditions.

1962 June, Cecil J. Allen, “Locomotive Running Past and Present”, in Modern Railways, page 399

If from adown the hopeful chopsThe fat upon the cinder drops,To stinking smoke it turns the flame,Poisoning the flesh from whence it came

1730, Jonathan Swift, The Lady's Dressing Room

Oh, horrid proposition! One would imagine, Tom, that you had been a coal-heaver. Had you said soda and cinder, I would have seconded the motion.

1846, Catherine Grace Frances Gore, Selected Works, volume 2, page 9

She'd sit by the fire, arms crossed, demanding that Ruby spike her tea with a cinder. But Ruby would never give in to her demands, no matter how much her mam begged. There was no alcohol in the house now; Arthur had made sure of that in an effort to get Mary sober.

2021, Glenda Young, The Miner's Lass