From Longman Dictionary of Contemporary Englishheat-seekingˈheat-ˌseeking adjective PMWa heat-seeking weapon is able to find and move towards the hot gases from an aircraft or rocket and destroy it
Examples from the Corpus
heat-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.• And Buchanan goes after it like a heat-seeking missile.• He was like a heat-seeking missile.• The only alternative is a heat-seeking missile.• Not unless they had radar or heat-seeking missiles, which they didn't. 