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Plural: apses, apsides

Noun

A large semicircular recess in a church, usually with a domed roof.
a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar
A semicircular projection from a building, especially the rounded east end of a church that contains the altar.
The bishop's seat or throne in ancient churches.
A reliquary, or case in which the relics of saints were kept.
Obsolete form of apsis (“the nearest and furthest points to the centre of gravitational attraction for a body in orbit”).
An aspen tree.

Examples

APSE is a short, simple word, but it fit perfectly into the tight spot.

Origin / Etymology

From Latin apsis, hapsis, from Ancient Greek ἁψίς (hapsís, “arch, vault”), from ἅπτω (háptō, “I bind, join”).

Synonyms

apsis, apside

Scrabble Score: 6

apse: valid Scrabble (US) TWL Word
apse: valid Scrabble Word in Merriam-Webster MW Dictionary
apse: valid Scrabble Word in International Collins CSW Dictionary

Words With Friends Score: 7

apse: valid Words With Friends Word