heat-seeking
From Longman Dictionary of Contemporary EnglishRelated topics: Weaponsheat-seekingˈheat-ˌseeking adjective PMWa heat-seeking weapon is able to find and move towards the hot gases from an aircraft or rocket and destroy itExamples from the Corpusheat-seeking• Tests of the tiny organs show that they respond to infrared light by swelling slightly, triggering heat-seeking behavior.• Police drafted armed officers into the village and called in a helicopter with heat-seeking equipment.