What's the difference between основной and основный?

They both seem to translate to "basic", although the first one seems to be more common.

2 Answers 2


Оснóвный with stress on the second syllable is used only as technical or scientific term.

Оснóвная нить - beam thread

Оснóвный оксид - basic oxide

Основнóй is a regular word meaning main, central, fundamental, basic.


I wouldn't say is necessarily should have something to do with science or technology. It's much simpler. "Оснóвный" means "related to оснóва" (base, bottom, foundation).

The translation of основнóй above is correct.

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