瓶胆

Traditional form:

瓶膽

Pinyin (reading):

píngdǎn

Definitions:

• the vacuum bottle within the outer case of a thermos

Characters:

• 瓶 - bottle, jug, pitcher, vase
• 胆 - gallbladder; gall, guts, courage

Traditional characters:

• 瓶 - bottle, jug, pitcher, vase
• 膽 - gallbladder; gall, guts, courage