planetesimal /.plæni'tesiml/ 📖 中文释义 n. 星子, 小行星体 🔗 释义中的汉语词 星子 🧩 词形变化 复数 planetesimals 📘 English Definition（英文释义） n. one of many small solid celestial bodies thought to have existed at an early stage in the development of the solar system ← planeted P 字母词表 planetesimal hypothesis →