say it: SEE-kur
seeker is a noun meaning "someone making a search or inquiry". It carries 2 recorded senses.
a missile equipped with a device that is attracted toward some kind of emission (heat or light or sound or radio waves)
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for seeker come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.