lookdown
/ˈlʊkdaʊn/noun
Originally US. A silvery carangid game fish, Selene vomer, found in the western Atlantic, having the eyes set high in a deep head.
adjective
Originally US. Designating an airborne or satellite radar system designed to distinguish the radar signal of an airborne body situated between it and the ground from those returned by the ground terrain; relating to or involving such radar.
Origin
Late 18th century (in an earlier sense). From look + down, after to look down.