Try Our Apps


Avoid these words. Seriously.


[mahy-kuh] /ˈmaɪ kə/
any member of a group of minerals, hydrous silicates of aluminum with other bases, chiefly potassium, magnesium, iron, and lithium, that separate readily into thin, tough, often transparent, and usually elastic laminae; isinglass.
Origin of mica
First recorded in 1700-10, mica is from the Latin word mīca crumb, morsel, grain
Related forms
micalike, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
Cite This Source
Examples from the Web for mica
Contemporary Examples
Historical Examples
  • The consequence was a vibration of the mica diaphragm to which the stylus was attached.

  • We can look upon the demand for mica as being in a certain sense settled.

    A Woman Intervenes Robert Barr
  • The mica has more than paid the working of the mine, and all the rest is clear profit.

    A Woman Intervenes Robert Barr
  • They are mining for mica, but the mine is more valuable in other respects than it is as a mica property.

    A Woman Intervenes Robert Barr
  • It is thus, thought we, that our manufacturers of fancy wax deal by their mica.

  • The three planes gleamed like mica in the intense blue of the sky.

    One Man's Initiation--1917 John Dos Passos
  • Granite is made of quartz, mica, and feldspar, as has been said before.

    Diggers in the Earth Eva March Tappan
  • It occurs in the various feldspars and feldspathic rocks, and in mica.

    Commercial Geography

    Jacques W. Redway
British Dictionary definitions for mica


any of a group of lustrous rock-forming minerals consisting of hydrous silicates of aluminium, potassium, etc, in monoclinic crystalline form, occurring in igneous and metamorphic rock. Because of their resistance to electricity and heat they are used as dielectrics, in heating elements, etc
Derived Forms
micaceous (maɪˈkeɪʃəs) adjective
Word Origin
C18: from Latin: grain, morsel
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
Cite This Source
Word Origin and History for mica

1706, from specialized use of Latin mica "crumb, bit, morsel, grain," originally *smika (form probably influenced by Latin micare "to flash, glitter"), from PIE *smik- "small" (cf. Greek smikros, Attic mikros "small;" Old High German smahi "littleness"). Related: Micaceous "containing mica."

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
mica in Science
Any of a group of hydrous aluminosilicate minerals with the general formula (K,Na,Ca)(Mg,Fe,Li,Al)2-3(Al,Si)4O10(OH,F)2that can be split easily into thin, partly transparent sheets. Mica is common in igneous and metamorphic rocks and often occurs as flakes or sheets. It is highly resistant to heat and is used in electric fuses and other electrical equipment. Muscovite and biotite are types of mica
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Nearby words for mica

Word Value for mica

Scrabble Words With Friends