由傾斜疊置的橫片、橫條或檔板構成的固定式或可調式裝置，可用以阻絕雨水或風雪，提供不同程度的通風或光照，以特定角度遮蔽光源或吸收多餘光照。用於門、窗、照明裝置、通風系統的吸入與排出口等。至於構造類似，但遮覆於開口上的橫條或檔板可以活動或更換，用以阻絕或調節視野或光照的裝置，則稱之為「百葉窗(覆蓋物)」。

百葉窗(百葉開口結構)　(P,,U,繁體中文-偏好,D,,)
百葉(,U,繁體中文-非偏好,UF,U,U)
pai yeh ch'uang (P,,U,韋氏拼音-偏好,UF,,)
bǎi yè chuāng (P,,U,漢語拼音-偏好,UF,,)
bai ye chuang (P,,U,漢語拼音(無聲調)-偏好,UF,,)
louvers(P,,U,美式英語-偏好,D,U,PN)
louver(,U,美式英語-非偏好,AD,U,SN)
louvres(P,,U,British English-偏好,D,U,PN)
louvre(,U,British English-非偏好,AD,U,SN)
jaloezieën(openingsonderdelen)　(P,,U,荷蘭語-偏好,D,U,U)
jaloezie(openingsonderdeel)　(,U,荷蘭語-非偏好,AD,U,U)
jalouzieën(,U,荷蘭語-非偏好,UF,U,U)
lucernas(componente de vano)　(P,,U,西班牙語-偏好,D,U,PN)
lucerna(componente de vano)　(,U,西班牙語-非偏好,AD,U,SN)
lumbrera(,U,西班牙語-非偏好,UF,U,SN)

藝術與建築詞典根目錄
....物件層面
........組件 (層級名)
............成分
................<依特定背景區分之組件>
....................建築元素
........................<開口與開口結構>
............................<開口結構>
................................<百葉窗與百葉窗結構>
....................................百葉窗 (百葉開口結構)

distinguished from....

百葉窗(覆蓋物)

英文....	Assemblies of sloping, overlapping blades, slats, or baffles, which may be fixed or adjustable; designed to exclude rain or snow, to admit air or light in varying degrees, to shield a light source from view at certain angles, or to absorb unwanted light. Used in doors, windows, lighting devices, and the intakes and exhausts of mechanical ventilation systems. For similar but flexible or removable devices of slats or baffles used to obstruct or regulate vision or light as coverings for openings, use "blinds (coverings)."
荷蘭語....	Assemblages van hellende, elkaar overlappende bladen, latten of schotten die vast kunnen zitten of verstelbaar kunnen zijn. Gemaakt om regen en sneeuw te weren, om lucht en licht in verscheidene mate binnen te laten, om een lichtbron vanuit bepaalde hoeken af te schermen, of om ongewenst licht te absorberen. Worden gebruikt bij deuren, ramen, verlichtingsapparaten en de in- en uitlaten van mechanische ventilatiesystemen. Voor gelijksoortige, maar beweegbare en afneembare, instrumenten die bestaan uit latten of baffles als bedekking voor openingen om zicht of licht te verhinderen of te reguleren, gebruik 'jaloezieën (bedekkingen)'.
西班牙語....	Assemblies of sloping, overlapping blades, slats, or baffles, which may be fixed or adjustable; designed to exclude rain or snow, to admit air or light in varying degrees, to shield a light source from view at certain angles, or to absorb unwanted light. Used in doors, windows, lighting devices, and the intakes and exhausts of mechanical ventilation systems. For similar but flexible or removable devices of slats or baffles used to obstruct or regulate vision or light as coverings for openings, use "blinds (coverings)."

百葉窗(百葉開口結構)............	[AS-Academia Sinica]
.................	朗文當代大辭典 1042
.................	國家教育研究院－雙語詞彙、學術名詞暨辭書資訊網 November 11, 2010
.................	智慧藏百科全書網 September 16, 2011
.................	牛津當代大辭典 1093
.................	台灣古建築圖解事典 199
.................	建築學英漢辭典 250
百葉............	[AS-Academia Sinica]
.................	智慧藏百科全書網 September 16, 2011
.................	世界建築經典圖鑑 332
louvers............	[VP]
.................	Dictionary of Architecture and Construction (1975)
.................	Kaufman and Christensen, IES Lighting Handbook (1984)
.................	Putnam and Carlson, Architectural and Building Trades Dictionary (1974) illustration
.................	Stein, Construction Glossary (1980) 574
.................	BHA Subject Headings (1985-)
louver............	[VP]
.................	Getty Vocabulary Program rules
louvres............	[VP]
.................	Roberts, Construction Industry Thesaurus (1976)
.................	Fleming et al., Penguin Dictionary of Architecture (1981) illustration
.................	RIBA, Architectural Keywords (1982)
louvre............	[VP]
.................	Getty Vocabulary Program rules
jaloezieën(openingsonderdelen)............	[Bureau AAT]
.................	AAT-Ned (1994-)
jaloezie(openingsonderdeel)............	[Bureau AAT]
.................	AAT-Ned (1994-)
jalouzieën............	[Bureau AAT]
.................	AAT-Ned (1994-)
lucernas(componente de vano)............	[CDBP-DIBAM]
.................	Comité, Plural del término en singular
lucerna(componente de vano)............	[CDBP-DIBAM]
.................	TAA database (2000-)
lumbrera............	[CDBP-DIBAM]
.................	Robb, Diccionario para Ingenieros (1979)
Subject:............	[Bureau AAT]
.................	RIBA, Architectural Keywords (1982) louvres: lighting; lighting: artificial: louvers
.................	Bureau AAT, RKD

Getty AAT: 300003166 Getty AAT: http://www.getty.edu/vow/AATFullDisplay?find=costume&logic=AND¬e=&subjectid=300003166
聯合目錄： 百葉窗 、百葉 、pai yeh ch'uang 、bǎi yè chuāng 、bai ye chuang 、louvers 、louver 、louvres 、louvre 、jaloezieën 、jaloezie 、jalouzieën 、lucernas 、lucerna 、lumbrera