Vocabulary What does 胎児 (たいじ, taiji) mean? 胎児 (たいじ, taiji) means fetus; foetus; embryo. Quick factsReadingたいじRomajitaijiPart of speechnoun 胎児たいじtaijifetus; foetus; embryo1noun fetus; foetus; embryoAlso written: 胎仔Kanji in this word胎fetus, womb児child