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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
/
How Machines Work
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
action
appliance
arm
ball bearing
bearing
belt
belt drive
bench test
blade
blueprint
bolt
bolt-on
break
break down
breakdown
button
cable
cannibalize
capacity
cog
console
controller
crane
crank
crank up
depress
dial
driveshaft
dynamo
first generation
fuse
gearing
generator
handmade
jam
knob
lathe
lever
machine
machine tool
machine-made
machinery
maintain
mechanical
mechanism
motor
nut
overhaul
press
prototype
pump
robot
roller
rotor
run
running repairs
safety valve
screw
service
servicing
servo
shaft
shut down
shut off
shutdown
spare part
sprocket
switch
switch off
time switch
timer
turbine
turn off
turn on
washer
wire
working