SAH Archipedia uses terms from the Getty Art and Architecture Thesaurus (AAT) to categorize and classify metadata for the entries in the database. For more information on the Getty AAT, click here

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igneous rock

Any of various crystalline or glassy rocks formed by the cooling and solidification of magma or other molten earth material. Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary.

Ilex (genus)

Genus containing around 400 species of red- or black-berried plants, including the popular Christmas hollies grown for ornamentation. Timber from the holly has a fine uniform texture. The trees provide shelter, protection from predators, and food for birds, other animals, and insects; the berries are mildly poisonous to humans. Ilex is the only living genus in the family Aquifoliaceae.

impregnated wood

Wood impregnated with thermosetting resin then subjected to heat and pressure to provide both resin curing and compression.

Indian red (pigment)

Synthetically produced brick red color iron oxide artists' pigment. Originally, the name "Indian red" was used for red earth pigments imported from the Persian Gulf and India; in the early 18th century, a synthetic Indian red composed of pure ferric oxide was made from steel mill wastes. It is a dense, opaque, permanent pigment.

Indiana limestone

A noncrystalline massive rock with aggregate filler and a matrix of 98% calcium carbonate in gray and buff colors; it is an oolitic limestone with small round grains resembling fish roe. Almost half of all the limestone used in the United States in block form is Indiana limestone.


Mass of any type of metal, cast into convenient shape for storage and transportation, to be rolled, forged, melted, or otherwise processed later. In some periods and cultures, such as in China, ancient Italy, and parts of Africa, they have been used as currency and as ceremonial objects.


Words, texts, lettering, or symbols marked on a work, including texts, legends, documentation notes, or commemoration. For standardized symbols or notations on objects that convey official information, use "marks (symbols)."

insulating glass

Window glass made of two sheets of glass separated by metal bonded to the edges of the glass, leaving an insulating layer of dehydrated air between the two panes.


A substance that is a nonconductor, so as to prevent the passage of heat, electricity, or sound.

interior shutters

Shutters, typically made of wood, mounted on the inside wall of a house, covering a window.

ipe wood
No description is available for this term.

iron (metal)

Pure metallic element having symbol Fe and atomic number 26; metallic iron is silvery in color, lustrous, soft, ductile, malleable, and slightly magnetic; it rusts when exposed to moist air. It is rarely found as a native metal (telluric iron) except in meteorites (meteoric iron). Iron is most often found throughout the world as iron oxides (hematite, magnetite, limonite, and siderite) mixed with other ores.

iron alloy

Alloy in which iron is the principle element.


General term for exceptionally tough or hard wood from any of numerous species of trees and shrubs, such as ebony, hornbeam, or acacia.

ironwork (visual works)

Visual works or parts of works made of iron, generally reserved for decorative forms fashioned in wrought or cast iron.

Italian marble
No description is available for this term.