'Discoverer' definitions:

Definition of 'discoverer'

noun

Someone who is the first to think of or make something [syn: inventor, discoverer, artificer]

noun

Someone who is the first to observe something [syn: finder, discoverer, spotter]

From: GCIDE

Discoverer \Dis*cov"er*er\, n.
1. One who discovers; one who first comes to the knowledge of something; one who discovers an unknown country, or a new principle, truth, or fact. [1913 Webster]
The discoverers and searchers of the land. --Sir W. Raleigh. [1913 Webster]
2. A scout; an explorer. --Shak. [1913 Webster]