ad·ven·ti·tia /ˌædvənˈtɪʃə, (ˌ)vɛn-/
ad·ven·ti·tia /ˌædvənˈtɪʃ(ɪ)ə, (ˌ)vɛn-/ 名詞 外膜,心結締外層
adventitia n : an enveloping or covering membrane or layer of body tissue [syn: tunic, tunica]