shim

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shim

1. a thin packing strip or washer often used with a number of similar washers or strips to adjust a clearance for gears, etc.
2. Physics a thin strip of magnetic material, such as soft iron, used to adjust a magnetic field
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Shim

A thin piece, usually wedged-shaped, placed or driven into a joint to level or plumb a structural member.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

shim

[shim]
(engineering)
In the manufacture of plywood, a long, narrow patch glued into the panel or cemented into the lumber core itself.
A thin piece of material placed between two surfaces to obtain a proper fit, adjustment, or alignment.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

shim

A thin piece of wood, metal, or stone, usually tapered, which is inserted under one member so as to adjust its height; used in adjusting the height of one surface so that it is flush with another.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

shim

(jargon, memory management)
A small piece of data inserted in order to achieve a desired memory alignment or other addressing property.

For example, the PDP-11 Unix linker, in split I&D (instructions and data) mode, inserts a two-byte shim at location 0 in data space so that no data object will have an address of 0 (and be confused with the C null pointer).

See also loose bytes.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

shim

Software that allows an older version of a program, framework or protocol to use the newer updated version. The shim may intercept a call to a programming interface (API) and convert the parameters, or it may hand it off to another routine. See polyfill.
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