This radical has actually the meaning: corpse 尸. But due to its use in tail 尾, urine 尿, or flatulence 屁, it is considered to generally mean 'buttocks'.
Vocabulary
细胞壁
xì bāo bì
cell wall
4236
白壁微瑕
bái bì wēi xiá
a slight blemish
9611
白壁无瑕
bái bì wú xiá
impeccable moral integrity
9610
悬崖峭壁
xuán yá qiào bì
cliffside
7638
峭壁
qiào bì
cliff; steep; precipice
7637
颓垣断壁
tuí yuán duàn bì
crumbling fences and dilapidated walls (idiom)
7533
崖壁
yá bì
escarpment; precipice; cliff
5893
戈壁
Gē bì
Gobi (desert)
4745
壁画
bì huà
mural (painting); fresco
4238
隔壁
gé bì
next door; neighbor
4237
阴道棕榈状壁
yīn dào zōng lǘ zhuàng bì
palmate folds of cervical canal; plicae palmatae canalis cervicis uteri
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