savant
[noun]
Synonyms: sage, scholar, wise man

[TahlilGaran] English Synonym Dictionary ▲

sav‧ant /ˈsævənt $ səˈvɑːnt, sæ-/ noun [countable] formal
[Date: 1700-1800; Language: French; Origin: present participle of savoir 'to know']

1. someone who knows a lot about a subject

2. someone who has mental problems and may have lower intelligence than average, but who can do one thing very well, such as adding numbers very quickly

[TahlilGaran] Dictionary of Contemporary English ▲