器

eyelid speculum; lid retractor

smoke filter

splitter (device that splits and reassembles signals from different frequencies)

resonator

basidium

voltage detector; voltage tester; electroscope

dimmer; dimmer control

water purifier

Computing

compander; compandor

Computing

coefficient unit; scale multiplier

Computing

subtracter

Computing

equalizer (audio too)

Computing

power distribution unit

Computing

comparator

Computing

decoder

Computing

frequency demultiplier; frequency divider

Computing

complementer

dispensing burette

collider

device to repel mosquitoes by fumigation

copper alloy with traces of silver, lead, or tin

microlith (small stone tool)

punch-style can opener (punches a round or V-shaped hole in a can of liquid)

Buddhism

mendicant priest's begging bowl