sil·i·cone

[sil-i-kohn]
noun Chemistry.
any of a number of polymers containing alternate silicon and oxygen atoms, as (–Si–O–Si–O–) n, whose properties are determined by the organic groups attached to the silicon atoms, and that are fluid, resinous, rubbery, extremely stable in high temperatures, and water-repellent: used as adhesives, lubricants, and hydraulic oils and in electrical insulation, cosmetics, etc.

Origin:
1905–10; silic(on) + -one

silicon, silicone.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To silicone
00:10
Silicone is always a great word to know.
So is interrobang. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Collins
World English Dictionary
silicone (ˈsɪlɪˌkəʊn) [Click for IPA pronunciation guide]
 
n
chem See also siloxane
 a.  any of a large class of polymeric synthetic materials that usually have resistance to temperature, water, and chemicals, and good insulating and lubricating properties, making them suitable for wide use as oils, water-repellents, resins, etc. Chemically they have alternate silicon and oxygen atoms with the silicon atoms bound to organic groups
 b.  (as modifier): silicone rubber

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

silicone sil·i·cone (sĭl'ĭ-kōn')
n.
Any of a group of silicon compounds in solid, liquid, or gel form, characterized by wide-range thermal stability, high lubricity, extreme water repellence, and physiological inertness and used in many medical products, including surgical implants and dental impression materials.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
silicone   (sĭl'ĭ-kōn')  Pronunciation Key 
Any of a class of chemical compounds consisting of long chains of alternating silicon and oxygen atoms, with two organic radicals, typically a methyl (CH3) and a phenyl (C6H5) group, attached to each silicon atom. Silicones are very stable and resist the effects of water, heat, and oxidizing agents. They are used to make adhesives, lubricants and synthetic rubber.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In this process body water and fats are replaced with liquid silicone rubber.
Made from stainless steel with silicone rubber buttons, this mouse can truly
  take a licking.
After that, light-sensitive silicone lenses may arrive.
Silicone is indeed incredibly common--and unusable in its natural form.
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