i Register
In some senses, guitar is marked as informal. Watch for register when choosing this word.
noun
A stringed musical instrument, of European origin, usually with a fretted fingerboard and six strings, played with the fingers or a plectrum (guitar pick).
Learning to strum the guitar rhythmically is essential.
She was carrying her guitar in a fancily-decorated case.
Any type of musical instrument of the lute family, characterized by a flat back, along with a neck whose upper surface is in the same plane as the soundboard, with strings along the neck and parallel to the soundboard.
verb
To play the guitar.
We guitared and drummed and head banged and pianoed.