touchhole
Noun
Meaning
The vent of a cannot or other firearm, by which fire is communicateed to the powder of the charge.
Source: Webster's dictionarySynonyms
inn
book
expression
hotel
emission
exit
declaration
discharge
shaft
announcement
fuse
vent
wick
hostel
nostril
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Examples
Another major change at this time was the development of a flintlock firing mechanism for the cannons to replace the old method of igniting powder in the cannon touchhole.
When the cannon was fired through the touchhole, turbulence from the initial surface combustion caused the rest of the powder to be rapidly exposed to the flame.