search engine

Short definition from Wiktionary

Noun

1. 1
   An application that searches for, and retrieves, data based on some criteria, especially one that searches the Internet for documents containing specified words.

Verb

1. 1
   Alternative form of search-engine.
2. 2
   To look up on a search engine.
3. 3
   To use a search engine; to look things up on a search engine.