heterostracan 📖 中文释义 a. Heterostraci的变形 🧩 词形变化 复数 heterostracans 📘 English Definition(英文释义) n. extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian ← Heterostigmata H 字母词表 heterostracans →