FOUNTAINHEAD
Meaning of FOUNTAINHEAD in English
foun ‧ tain ‧ head /ˈfaʊntənhed, ˈfaʊntɪnhed $ ˈfaʊntn-/ BrE AmE noun [singular]
the origin of something SYN source
Longman Dictionary of Contemporary English.
Longman - Словарь современного английского языка.
2012