grand duke

English

Old French grant duc, from Latin grandis + dux, from the verb duco (“to lead”).

grand duke (plural grand dukes)

Ruler or monarch of a grand duchy.
Son, daughter, or grandchild of a czar (emperor) of the Russian Empire. (A more literal translation of the Russian is grand prince.)

ruler or monarch of a grand duchy

Arabic: غْرَانْدُوق m (ḡrāndūq)
Catalan: gran duc m
Chinese:
Mandarin: 太公 (zh) (tàigōng)
Czech: velkovévoda m
Danish: storhertug c (Luxembourg, German states and Western Europe), storfyrste c (Lithuania, Moscow and tsarist Finland)
Dutch: groothertog (nl) m
Esperanto: grandduko
Finnish: suurherttua
French: grand-duc (fr) m
Georgian: ერისმთავარი (erismtavari), დიდი მთავარი (didi mtavari)
German: Großherzog (de) m
Hungarian: nagyherceg (hu)
Icelandic: stórhertogi m
Indonesian: adipati agung, haryapatih
Irish: ard-diúc. m
Italian: granduca (it) m
Khmer: សម្ដេចចៅពញា m (sɑmdach chav pnyie), លោកអ្នកឧកញ៉ា (lok neak ok nha)
Latvian: lielhercogs m
Old Ruthenian: вели́кий князь (velíkij knjazʹ)
Ottoman Turkish: غراندوقه (granduka)
Persian: گراندوک (gerânduk)
Polish: wielki książę m
Portuguese: grão-duque m
Russian: вели́кий ге́рцог m (velíkij gércog), эрцге́рцог (ru) m (ercgércog)
Spanish: gran duque
Swedish: storhertig (sv) c
Thai: แกรนด์ดุ๊ก, แกรนด์ดยุก
Turkish: granduka (tr), grandük (tr)

son or grandson of a czar