內壁

内壁
nèibì
  1. (architecture, anatomy) inner wall
  2. inner wall

Wiktionary

Entry Composition

=1 內 nèi
  1. inside
  2. inner
  3. internal
  4. within
  5. interior
=1 內 nà
  1. (obsolete on its own in Standard Chinese) Original form of 納／纳 (nà, “to pay”).
  2. (obsolete on its own in Standard Chinese) to enter
  3. Original form of 納／纳 (nà, “to pay”).
  4. to enter
2 壁 bì
  1. wall
  2. rampart