胚芽鞘

胚芽鞘	pēi yá qiào	coleoptile, protective sheath covering an emerging shoot (botany)
胚	pēi	variant of 胚
胚	pēi	embryo
胚芽	pēi yá	bud / sprout / germ
芽	yá	bud / sprout
鞘	qiào	scabbard; sheath