peri·derm /ˈpɛrəˌdɚ/ 周皮
peri·derm /ˈpɛrəˌdɝm/ 名詞 周皮
Per·i·derm n. 1. Bot. The outer layer of bark. 2. Zool. The hard outer covering of hydroids and other marine animals; the perisarc. ◄ ►