溶洞

Traditional form:

溶洞

Pinyin (reading):

róngdòng

Definitions:

• (geology) solutional cave (typically, a limestone cave)

Characters:

• 溶 - to melt, to dissolve
• 洞 - cave, grotto, hole, ravine

Traditional characters:

• 溶 - to melt, to dissolve
• 洞 - cave, grotto, hole, ravine