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[uh-klood] /əˈklud/
verb (used with object), occluded, occluding.
to close, shut, or stop up (a passage, opening, etc.).
to shut in, out, or off.
Physical Chemistry. (of certain metals and other solids) to incorporate (gases and other foreign substances), as by absorption or adsorption.
verb (used without object), occluded, occluding.
Dentistry. to shut or close, with the cusps of the opposing teeth of the upper and lower jaws fitting together.
Meteorology. to form an occluded front.
Origin of occlude
1590-1600; < Latin occlūdere to shut up, close up, equivalent to oc- oc- + -clūdere, combining form of claudere to close
Related forms
occludent, adjective
unoccluded, adjective
1. obstruct, clog, block, plug. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for unoccluded


(transitive) to block or stop up (a passage or opening); obstruct
(transitive) to prevent the passage of
(transitive) (chem) (of a solid) to incorporate (a substance) by absorption or adsorption
(meteorol) to form or cause to form an occluded front
(dentistry) to produce or cause to produce occlusion, as in chewing
Derived Forms
occludent, adjective
Word Origin
C16: from Latin occlūdere, from ob- (intensive) + claudere to close
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for unoccluded



1590s, from Latin occludere (past participle occlusus) "shut up, close up," from ob "against, up" (see ob-) + claudere "to shut, close" (see close (v.)). Of teeth, 1888 (also cf. occlusion). Related: Occluded; occluding.

Online Etymology Dictionary, © 2010 Douglas Harper
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unoccluded in Medicine

occlude oc·clude (ə-klōōd')
v. oc·clud·ed, oc·clud·ing, oc·cludes

  1. To cause to become closed; obstruct.

  2. To prevent the passage of.

  3. To bring together the upper and lower teeth in proper alignment for chewing.

  4. To enclose a virus, as in an inclusion body.

  5. In chemistry, to absorb and retain gases and other substances.

oc·clud'ent adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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unoccluded in Science
To force air upward from the Earth's surface, as when a cold front overtakes and undercuts a warm front.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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