凝血素 Traditional form: 凝血素 Pinyin (reading): níngxuèsù Definitions: hemaglutinin (protein causing blood clotting) Characters: 凝 - to coagulate, to congeal; to freeze 血 - blood 素 - plain; white; vegetarian; formerly; normally Traditional characters: 凝 - to coagulate, to congeal; to freeze 血 - blood 素 - plain; white; vegetarian; formerly; normally