counter for injection ampoules
Specialized counter used in medical or pharmaceutical contexts for ampoules or vials. Not a general counter for cylindrical objects.
This medicine contains 5 milliliters per ampoule.
Pour the liquid into the glass cylinder.
Standalone noun meaning 'tube' or 'pipe', while 筒 (とう) is a suffix used in compounds.
envelope
water bottle; canteen; flask; thermos
cylinder (of an engine)
cylinder
warning flare; road flare; railway flare
single barrel; single-barrelled
pump
multiple barrels; multi-barrel
tail covert (of a bird) · tail pipe (of a turbine) · receiver (of a rifle)
The kanji 筒 originally depicts a bamboo tube. The reading とう is the on'yomi, used in compound words.
chimney · kiseru; Japanese smoking pipe
feeder tube; chlorine feeder tube · cartridge; ammunition cartridge
lens barrel; lens tube
cartridge
extractor (rifle)
grenade launcher