A device that responds to a physical stimulus (as heat, light, sound, pressure, magnetism, or a particular motion) and transmits a resulting impulse (as for measurement or operating a control).
sensor
15
a device or hole for catching animals or people and preventing their escape
trap
15
a camera that checks out what is going on somewhere for security reasons
CCTV camera
15
a number of devices designed to scare birds
bird scarer
15
a bird that hunts and eats other animals
bird of prey
15
the fence around the outer edge of an area of land or the border around it
perimeter fence
15
the grassy area right next to the runway
grass margin
15
a substance that causes illness, injury or death if taken into the body or produced within the body.
poison
15
a dog that has been trained to find drugs or explosives by using its sense of smell
