From Japanese-German FreeDict Dictionary ver. 0.2.0:
[ichi1] 臍 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, [ichi1] へそ /hˈe̞so̞/, ほぞ /hˈo̞zo̞/, () ヘソ /hˈe̞so̞/
(noun (common) (futsuumeishi))
Note: word usually written using kana alone(1) (m) Nabel, (m) Umbilicus, (2) etw., das dem Nabel ähnelt, (3) (n) Zentrum, (m) Nabel