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Browse Topic Dictionaries
Build your topic vocabulary with these mini-dictionaries, which are groups of words related to common subject areas.
Choose a topic area from the list below to get started.
Categories Home
/
Science
/
Engineering
/
Devices
Categories Home
Science
Engineering
Devices
How machines work
Materials and properties
Structures
Mathematics
Mathematical terminology
Types of mathematics
The natural sciences
Cell biology
Electronics
Energy and physical forces
Experiments and research
Genetic engineering
Molecules and matter
activate
actuate
adaptor
alternator
amplifier
antenna
battery
bleeper
buzzer
calculator
chronograph
clock
computer
contrivance
deactivate
device
dynamo
extension lead
food processor
functionality
gadget
hairdryer
handset
high technology
high-tech
instrument
insulator
jack
meter
mobile device
photoelectric cell
probe
remote control
sensor
shaver
sleep mode
solar cell
television
thermostat
timer
toaster
turn off
zapper