Learn how to say Dulcimer correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word dulcimer:
a musical instrument with a sounding board or box, typically trapezoid in shape, over which strings of graduated length are stretched, played by plucking or especially by being struck with handheld hammers. The term hammered dulcimer is sometimes used, especially in the US, to distinguish these from plucked instruments such as the Appalachian dulcimer.
late 15th century: from Old French doulcemer, probably from Latin dulce melos ‘sweet melody’