A device used in a moving object, especially a missile, that locates a target by detecting light, heat, or other radiation.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "seeker" in a sentence
"I guess I generally use the term seeker to describe myself."
"Being a seeker is a vocation, a job God calls some of us to do, like an artist, a doctor, a teacher … or a nun."
"So don’t throw the term seeker around until you actually spend sometime looking for yourself."