Merriam-Webster Online Dictionary

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Main Entry: 1iso·late
Pronunciation: 'I-s&-"lAt also 'i-
Function: transitive verb
Inflected Form(s): -lat·ed; -lat·ing
Etymology: back-formation from isolated set apart, from French isolé, from Italian isolato, from isola island, from Latin insula
Date: 1799
1 : to set apart from others; also : QUARANTINE
2 : to select from among others; especially : to separate from another substance so as to obtain pure or in a free state
3 : INSULATE
- iso·la·tor /-"lA-t&r/ noun