noun
granduncle; great-uncle
Refers to a grandparent's brother. In Japanese, the distinction between older/younger brother of the grandparent is often not specified, but 大叔父 (with 叔) can imply a younger brother, while 大伯父 (with 伯) can imply an older brother. In practice, 大叔父 is the most common spelling.
私の大叔父は戦争で亡くなった。
My granduncle died in the war.
大叔父の家は田舎にある。
My granduncle's house is in the countryside.
Compound of 大 (おお, 'great') + 叔父 (おじ, 'uncle'), literally 'great uncle'. The reading おおおじ is a straightforward combination of these elements.