noun
Ottoman Empire
Historical term for the empire that existed from the late 13th century to the early 20th century, centered in Anatolia.
オスマン帝国は第一次世界大戦後に崩壊した。
The Ottoman Empire collapsed after World War I.
トルコ refers to the modern Republic of Turkey, while オスマン帝国 refers specifically to the historical Ottoman Empire.
From the name of Osman I, the founder of the dynasty, combined with 帝国 (empire).