洞	995B00   63A.42-4	部居	畫數  9	ㄉㄨㄥˋ [dong4] .
N	(1)  Cave, cavern, grotto: 山洞 cave in mountains; 仙洞 fairy grotto; 洞穴，洞窟 [dong4xUe4], [dong4ku4]↓. (2)  A hole, leak: 洞孔，孔洞 a hole; leakage (in argument, plan); 洞口 entrance to cave.
Adj	Open, clear, thorough: 空洞 empty; 洞明，洞澈 clear, transparently clear; 洞若觀火 clear like looking at fire.
Adv	Clearly, through: 門戶洞開 gate is wide open; 洞見 see through; 洞燭其奸 see through his treachery; (in correspondence, court.) 洞悉，洞察 see through; 洞鑒 please be kindly informed; 世事洞明皆學問 to understand practical affairs clearly is (also) knowledge (not only book knowledge).
Words	1.洞澈 [dong4che4], adj. & adv., clear, -ly.  2.洞穿 [dong4chuan1], v.i. & t., penetrate, pierce through.  3.洞房 [dong4fang2], n., nuptial chamber: 洞房花燭夜 wedding night.  4.洞府 [dong4fu3], n., abode of fairies.  5.洞窟 [dong4ku4], n., cave, cavern.  6.洞簫 [dong4xiao1], n., bamboo flageolet.  7.洞穴 [dong4xUe4], n., cave.  8.洞天 [dong4tian1], n., cave as fairies’ abode: 洞天福地 some scenically beautiful place (as near temple); 別有洞天 hidden but beautiful spot, a world all its own.  9.洞庭湖 [dong4ting2hu2], n., name of big lake in Hunan.