Where does “ordu” come from?

ordu (English) comes from Turkish ordu, from Ottoman Turkish اردو, from Proto-Turkic ordu — army, camp.

Ancestry of “ordu”, step by step

ordu traces back through two separate lines of ancestry.

via Turkish ordu

StepLanguageWordMeaning
1Turkishorduarmy
2Ottoman Turkishاردوmilitary camp
3Proto-Turkicorduarmy, camp

via Classical Mongolian ᠣᠷᠳ᠋ᠤ

StepLanguageWordMeaning
1Classical Mongolianᠣᠷᠳ᠋ᠤ—
Every word from Proto-Turkic ordu →Every word from Ottoman Turkish اردو →Every word from Turkish ordu →