Word: otsu
Part of speech: Adjective
Syllables: ot
su
Definition: In Old Japanese, one of two sets of vowels of uncertain pronunciation which fell together in modern Japanese.
Morphemes:
Affix: otsu
Language: en
PoS: Adjective
Meaning: In Old Japanese, one of two sets of vowels of uncertain pronunciation which fell together in modern Japanese.
Etymology Compounds: Affix: 乙
Language: ja
Decoded: Yi 
Meaning: second