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HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY

sensor

Noun

sen=sor

WORDNET DICTIONARY

sensor(n = noun.artifact) detector, sensing element - any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner; Array

is a kind of device

has particulars: metal detector, mine detector, electric eye, magic eye, photocell, photoconductive cell, photoelectric cell, trace detector

Derived form verb sense₁

sensor, a.

Sensory; as, the sensor nerves. [1913 Webster]

sensor, n. a device giving a signal for the detection or measurement of a physical property to which it responds.

Etymology

SENSORY, after MOTOR

For further exploring for "sensor" in Webster Dictionary Online