papilla
noun [ C ] medical specialized uk/pəˈpɪl.ə/ us/pəˈpɪl.ə/ papillae /pəˈpɪl.iː/
乳突
a small, round raised structure at the base of hair or teeth, or on the tongue, where it is involved in taste
Hair begins growing in a tube called the papilla. 头发从一个叫做毛突乳的管中开始生长。