könyv

Etymology 1
A wanderword of unclear origin, likely related to 🇨🇬 and 🇨🇬; see there for a discussion of possible ultimate origins. The earlier nominative singular was,. The modern is a  from the  roots of their declined forms (compare the inflection of, ).

Noun

 * 1) book

Declension
Note that, while the last syllable of "könyv" does have a front rounded vowel, the linking vowel taken by the plural, the accusative singular, and the first and second person singular possessive endings is "-e-" rather than "-ö-". This is because "könyv" is part of a class of words that take a "lowered" (and unrounded, in this case) linking vowel in such cases. A list of such words can be found in this appendix: Low-Vowel Words.

Etymology 2
See.