What's the difference between exedra and exhedra?

Exedra

Definition:

• (n.) A room in a public building, furnished with seats.
• (n.) The projection of any part of a building in a rounded form.
• (n.) Any out-of-door seat in stone, large enough for several persons; esp., one of curved form.

Example Sentences:

Exhedra

Definition:

• (n.) See Exedra.

Example Sentences: