a stringed musical instrument with a long, fretted neck, a flat, somewhat violinlike body, and typically six strings, which are plucked with the fingers or with a plectrum.

1615–25; < Spanish guitarra < Arabic kītārahGreek kithára kithara Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
guitar (ɡɪˈtɑː)
music electric guitar bass guitar See also Hawaiian guitar a plucked stringed instrument originating in Spain, usually having six strings, a flat sounding board with a circular sound hole in the centre, a flat back, and a fretted fingerboard. Range: more than three octaves upwards from E on the first leger line below the bass staff
[C17: from Spanish guitarra, from Arabic qītār, from Greek kitharacithara]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1621, ult. from Gk. kithara "cithara," a stringed musical instrument related to the lyre, perhaps from Pers. sihtar (see sitar); the name reached Eng. several times, including early 14c. giterne, in reference to various stringed, guitar-like instruments; the modern word is
directly from Sp. guittara, from Arabic qitar, from the Gk.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

guitar definition

A stringed musical instrument (see strings) usually played by strumming or plucking. Guitars are widely used in folk music and, often amplified electronically, in country and western music and rock 'n' roll.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
He has been learning to play the guitar for a little over a year now.
But that still doesn't demystify the acoustic guitar.
The solid spruce top helps the guitar achieve a depth of tone that belies its
  slight dimensions.
His interests include playing the guitar and computer games.
Images for guitar
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