entries → 洞穴
TSUMUGU · TOCFL 5 (est.) · 詞
洞穴 word · TOCFL 5 (est.)
洞穴 ＝ 洞 ＋ 穴
ㄉㄨㄥˋ ㄒㄩㄝˊ · dòngxué
noun — a cave; a cavern

字源 FORM — what the parts do

洞a hole, a cave (山洞)dòngwater 氵; 同 tóng gives the sound
穴a cave, a den (穴居)xué
洞穴，山洞的洞，穴居的穴。
關 · Related
山洞shāndòngthe same 洞 — a cave in a hill