thorn

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thorn,

sharp-pointed projection on some plants, usually protective in function. Botanically, thorns are distinguished as modified stems (as in the honey locust and hawthorn) from spines, which are modified leaves (as in the barberry), and from prickles, which are epidermal outgrowths of the bark (as in the rose and blackberry). Cacti have both thorns and spines.

Thorn:

see ToruńToruń
, Ger. Thorn, city (1993 est. pop. 201,700), capital (with Bydgoszcz) of Kujawsko-Pomorskie prov., N central Poland, on the Vistula River. It is a river port and a railway junction.
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, Poland.
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What does it mean when you dream about a thorn?

Thorns are usually associated with suffering. The dreamer may be “sacrificing” his or her own life for others, thereby becoming a “martyr.”

The Dream Encyclopedia, Second Edition © 2009 Visible Ink Press®. All rights reserved.

thorn

[thȯrn]
(botany)
A short, sharp, rigid, leafless branch on a plant.
(zoology)
Any of various sharp spinose structures on an animal.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

thorn

the messenger of Satan. [N.T.: II Corinthians 12:7]
Allusions—Cultural, Literary, Biblical, and Historical: A Thematic Dictionary. Copyright 2008 The Gale Group, Inc. All rights reserved.

thorn

1. a sharp pointed woody extension of a stem or leaf
2. 
a. any of various trees or shrubs having thorns, esp the hawthorn
b. the wood of any of these plants
3. a Germanic character of runic origin Þ used in Old and Modern Icelandic to represent the voiceless dental fricative sound of th, as in thin, bath. Its use in phonetics for the same purpose is now obsolete
4. this same character as used in Old and Middle English as an alternative to edh, but indistinguishable from it in function or sound
5. Zoology any of various sharp spiny parts
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005