seeker

[see-ker]
noun
1.
a person or thing that seeks.
2.
Rocketry.
a.
a device in a missile that locates a target by sensing some characteristic of the target, as heat emission.
b.
a missile equipped with such a device.

Origin:
1300–50; Middle English; see seek, -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
seeker

noun
1. someone making a search or inquiry; "they are seekers after truth" 
2. a missile equipped with a device that is attracted toward some kind of emission (heat or light or sound or radio waves) 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences for seekers
Asylum seekers should have to wait in camps for the decisions on their asylum requests.
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