Sedilia

Sedilia - Seats for the clergy, generally three (for priest, deacon and sub-deacon) and of masonry, in the wall on the south side of the chancel.
Segment - Part of a circle smaller than a semicircle.

Sedilia
Recessed seats in the south wall of the chancel for the priest, deacon and sub-deacon.
Soffit ...

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Seats for priests on the south side of the chancel. They are usually recessed into the chancel wall and usually three in number.
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Sedilia
A row of one or more seats near the altar for the officiating priest and his assistants.

sedilia: seats for clergy carved in stone on the south wall of a chancel.
segmental arch: an arch formed in the shape of a segment of a circle, usually less than a semi-circle.

SEDILE: one of the individual bays forming a SEDILIA or, unusually, a sedilia formed of just bay. SEDILIA: (functioning as singular) a succession of recesses, usually in the south wall of a chancel, designed to provide seats for the clergy.

Sedilia. - Recessed stone seats in the south wall of the chancel, used for the priest, deacon and sub-deacon at Mass.
Soffit. - The exposed underside of any overhead component of a building, such as an arch, balcony, beam, cornice, or lintel.

SectionTwo-dimensional representation of a building, moulding etc., revealed by cutting across it.Sedilia (singular: sedile)Seats for the priests (usually three) in the wall on the south side of the chancel of a church or chapel.

sedilia A set of stone seats close to an altar for use by the officiating priests. shrine A building or place (from an entire church or temple to a small plaque or statue) used for devotion commemorating an event or person.

See also: Church, Ornament, Chancel, Moulding, Screen