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cannel coal(ˈkænəl) or
(Mining & Quarrying) a dull coal having a high volatile content and burning with a smoky luminous flame
[C16: from northern English dialect cannel candle: so called from its bright flame]
can′nel coal`(ˈkæn l)
an oily, compact coal that burns readily and brightly. Also called can′nel.
[1530–40; cannel, dial. form of candle]