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(both: klĭr`stōr'ē, –stôr'ē), a part of a building whose walls rise higher than the roofs of adjoining parts of the structure. Pierced by windows, it is chiefly a device for obtaining extra light. It had an early use in certain Egyptian temples, as at Karnak, and was used later in the great halls of Roman basilicas. It became a characteristic element of medieval churches, receiving its fullest development in churches of the Gothic period.
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An upper story or row of windows rising above the adjoining parts of the building, designed as a means of admitting increased light into the inner space of the building.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved


The upward extension of enclosed space achieved by bringing a windowed wall up to interrupt the slope of the roof.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

clerestory, clerestory window

clerestory, 2 A
1.An upper zone of wall pierced with windows that admit light to the center of a lofty room.
2. A window so placed. (See illustration p. 218.)
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.


, clearstory
1. a row of windows in the upper part of the wall of a church that divides the nave from the aisle, set above the aisle roof
2. the part of the wall in which these windows are set
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Predicting understorey vegetation cover from overstorey attributes in two temperate mountain forests.
Variation in overstorey structure is limited by the dominance of Shorea and the understorey structure is relatively diverse, composed of Ardisia solanacea, Colebrookia oppositifolia, Clerodendrum viscosum, and Murraya koenigii.
Vegetation at the Victoria Valley (Grampians) study site is generally described as a 'sandy heathland assemblage' with the dominant overstorey species including L.
Scanlan JC, Burrows WH (1990) Woody overstorey impact on herbaceous understorey in Eucalyptus spp.
Overstorey composition and age as determinants of the understorey flora of woods of central New England.
Sampled areas of native vegetation were typical for the region, with a jarrah (Eucalyptus marginata) overstorey and a diverse understorey of perennial shrubs and non-woody, grass-like species as well as winter annuals and some geophytes (Grove et al.
Te tree was located within an area of wet sclerophyll forest characterised by an overstorey of E.
There is increasing evidence of premature decline of overstorey Eucalyptus in localised areas across a diverse range of forest types in temperate Australia (Archibald et al., 2005; Ellis, 1971, 1985; Kirkpatrick, 1986; Lunt, 1998; Withers & Ashton, 1977; Werkman et al., 2008).
The vegetation consists of a mixed species dry sclerophyll overstorey dominated by Eucalyptus obliqua and E.
Ough suggests forest management could be improved by retaining areas in the coupe from which machinery is excluded, but timber extracted, broadening seed collection and sowing operations to include some understorey trees and shrubs, retaining of some understorey and overstorey to provide protection and seeds, and minimising weeds.
The overstorey is dominated by Red Ironbark Eucalyptus tricarpa L.A.S.