Vocabulary What does 大さじ (おおさじ, oosaji) mean? 大さじ (おおさじ, oosaji) means tablespoon. Quick factsReadingおおさじRomajioosajiPart of speechnoun 大さじおおさじoosajitablespoon1noun tablespoonAlso written: 大匙Kanji in this word大big, large