- 류두 (ryudu)
- a midsummer festival of obsolete Korean tradition held on the 15th of June of the lunar calendar. Remarkably, people washed their hair in rivers especially flowing eastward, hence the name.
- 유두물 (yudumul): rainfall around the festival
- 유두벼 (yudubyeo): rice crop dedicated to the ancestors
- 유두연 (유두宴, yuduyeon): open-air party of the festival
- 여름 (yeoreum): summer
- 겨울 (gyeoul): winter
- (anatomy) nipple