umbilicus

n.[生]脐；[植]种脐；中心；核心

I cut open the umbilicus area by two mm in front of the umbilical cord. 我在脐带之前减低二毫米的公开脐区域。

There are some changes on the umbilicus of fruit related to cut part of style. 果脐有变化，这与短截花柱有关。