Meaning

noun someone making a search or inquiry

noun a missile equipped with a device that is attracted toward some kind of emission (heat or light or sound or radio waves)

originFrom Middle English sekar, sekere (also sechar, sechere), equivalent to seek + -er. Compare Saterland Frisian Säiker (“seeker”), West Frisian syker (“seeker”), Dutch zoeker (“seeker”), German Low German Söker (“seeker”), German Sucher (“seeker”).

Etymology from Wiktionary, CC BY-SA 3.0