thumb

(redirected from thumbs)
Also found in: Dictionary, Thesaurus, Medical, Idioms.
Related to thumbs: all thumbs

thumb

1. the first and usually shortest and thickest of the digits of the hand, composed of two short bones
2. the corresponding digit in other vertebrates
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Thumb

(processor)
An extension to the Advanced RISC Machine architecture, announced on 06 March 1995 by Advanced RISC Machines Ltd. By identifying the critical subset of the ARM instruction set and encoding it into 16 bits, ARM has succeeded in reducing typical program size by 30-40% from ARM's already excellent code density. Since this Thumb instruction set uses less memory for program storage, cost is further reduced.

All Thumb-aware processor cores combine the capability to execute both the 32-bit ARM and the 16-bit Thumb instruction sets. Careful design of the Thumb instructions allow them to be decompressed into full ARM instructions transparently during normal instruction decoding without any performance penalty. This differs from other 32-bit processors, like the Intel 486SX, with a 16-bit data bus, which require two 16-bit memory accesses to execute every 32-bit instruction and so halve performance.

The patented Thumb decompressor has been carefully designed with only a small amount of circuitry additional to the existing instruction decoder, so chip size and thus cost do not significantly increase. Designers can easily interleave fast ARM instructions (for performance critical parts of a program) with compact Thumb code to save memory.

thumb

(jargon)
The slider or "bubble" on a window system scrollbar. So called because moving it allows you to browse through the contents of a text window in a way analogous to thumbing through a book.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

thumb

(1) See scroll bar and thumb culture.

(2) (Thumb) An extension to the architecture of an ARM chip that provides enhanced code density. It stores a subset of 32-bit instructions as compressed 16-bit instructions and decompresses them back to 32 bits upon execution. See ARM.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in classic literature ?
THEN there was no end to the rage and disappointment of Tom Thumb and Hunca Munca.
TOM THUMB went up the kitchen chimney and looked out at the top--there was no soot.
"'Now kick in, damn you, Bill Roberts, an' finish'm' the referee says to me, an' I tell'm to go to hell as Bill an' me flop into the next clinch, not hittin', an' Bill touches his thumb again, an' I see the pain shoot across his face.
"I leave it to any expert in the world whether that is not the mark of his thumb."
When those packets were sealed up, Jonas Oldacre got McFarlane to secure one of the seals by putting his thumb upon the soft wax.
Oofty-Oofty laid hold of Parsons's thumb, pulling it out stoutly and snapping it back into place.
'Now,' she said, 'put the ring upon the thumb of your left hand, and you will see how strong that hand has become.
You must also be armed with a spear two fathoms long, which you will be able to wield by means of the magic ring upon your left thumb. The spear must be as thick in the middle as a large tree, and both its ends must be sharp.
"I've got him here," he whispered, jerking his thumb over his shoulder; "he's all right."
"And now, Doctor, perhaps you would kindly attend to my thumb, or rather to the place where my thumb used to be."
"That's a fine line," he said at last, indicating with his thumb what pleased him.
She talked with much gesticulation of the thumb, and Philip, to whom all she said was new, listened with profound but bewildered interest.