wall, lining (stomach), fence
壁 centers on a vertical barrier that separates or encloses: a wall, fence, or the lining of an organ like the stomach.
壁 combines 辟 (likely a phonetic component) with 土 (earth), suggesting an earthen wall or barrier.
The top part 辟 looks like a complex barrier, and the bottom 土 is earth. Picture a sturdy earthen wall built to keep things out.
For ヘキ, imagine a wall so strong it makes a heavy 'heck' sound when you hit it: heck -> ヘキ, the sound of a solid wall.
wall; partition
wallpaper
enclosing wall; boundary fence
castle wall; town walls; defensive wall; rampart
outer wall
surface of a wall
fresco; mural; wall painting
iron wall; impregnable fortress
wall with exposed timber pillars
protective wall; defensive wall; barrier; bulwark
barrier wall; bulkhead; partition; septum; diaphragm
precipice; cliff
quay; wharf; jetty
wall-mounted ornament; wall decoration; wall hanging
close to the wall; alongside the wall
inner wall
precipitous cliff; sheer precipice
white plaster wall
side wall
breastwork; parapet