1. 肛门：functional residual capacity 机能残气量 | fundament 肛门 | fundectomy 胃底部切除术
2. 基础,根本：→ fund 资金,基金;投资,资助 | → fundament 基础,根本 | → fundamental 基础的,基本的
3. 臀部/肛门/基础：fund-raising /筹募基金活动/ | fundament /臀部/肛门/基础/ | fundamentalism /正统派基督教/此派的运动/
noun
1. lowest support of a structure
e.g. it was built on a base of solid rock
he stood at the foot of the tower
Synonym: foundation base foot groundwork substructure understructure
2. the fleshy part of the human body that you sit on
e.g. he deserves a good kick in the butt
are you going to sit on your fanny and do nothing?
Synonym: buttocks nates arse butt backside bum buns can hindquarters hind end keister posterior prat rear rear end rump stern seat tail tail end tooshie tush bottom behind derriere fanny ass
3. fundament
3. the fundamental assumptions from which something is begun or developed or calculated or explained
e.g. the whole argument rested on a basis of conjecture
Synonym: basis base foundation groundwork cornerstone