mooddetector
nounUK /ˈmuːd dɪˌtektə/
US /ˈmuːd dɪˌtektər/
A mood detector is a tool that tells you how someone is feeling.
The mood detector showed a happy face when the baby laughed.
OTHER MEANINGS
2. A computer program that guesses the feeling behind words in a message.
The mood detector said the email sounded excited.
3. A toy or gadget that changes color based on how you feel.
My mood detector ring turned blue when I felt calm.
4. A person who is good at noticing how others feel.
Grandma is a real mood detector; she always knows when I am sad.