Guitar (noun)

1. A stringed musical instrument with a fretted fingerboard, typically incurved sides, and six or twelve strings.
2. A musical instrument of the lute family, having six strings and a fretted fingerboard.
3. A string instrument with a fretted fingerboard and six or twelve strings that is played with the fingers or a pick.
4. A popular instrument for accompanying singing or playing solos.

Origin:

Mid 16th century: from spanish guitarra, probably of greek origin.

Examples:

1. He played the guitar beautifully.
2. The musician tuned his guitar before the concert.
3. She learned to play the guitar when she was young.
4. The guitar is an essential instrument in most bands.
5. He has a large collection of guitars.