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imbrex, pl. imbrices (Latin)

A raised curved tile for covering the ridge of a sloped roof and the joint between the bent edges of the flat roof tiles (tegulae). Originally ceramic, later – made of marble. Kalupter in Greek.

impluvium, pl. impluvia (Latin)

Pool set under the opening in the middle of the Roman atrium where rainwater was collected.

impost (Latin)

Projecting block on top of a column supporting an arch (e.g. in Early Byzantine architecture, 5th-6th cc.), designed to transfer the weight from the arches to the columns.

insula, pl. insulae (Latin)

1. Isolated block in ancient Greek and Roman cities bounded by four streets.

2. Detached multi-storied residential building in the architecture of the Roman Empire.

intercolumniation (Latin)

The distance between the adjacent columns in a colonnade or arcade at the lower parts of their shafts. Within a colonnade or arcade the intercolumnation is constant.

isodomon (Greek)

Masonry consisting of blocks of stone of equal height.