Princeton's WordNet

1. marimba, xylophone(noun)

   a percussion instrument with wooden bars tuned to produce a chromatic scale and with resonators; played with small mallets

Kernerman English Learner's Dictionary

1. xylophone(noun)ˈzaɪ ləˌfoʊn

   a percussion instrument with a row of wooden bars that produce different notes

   to play the xylophone

Wiktionary

1. xylophone(Noun)

   a musical instrument made of wooden slats graduated so as to make the sounds of the scale when struck with a small drumstick-like hammer.

   All I know how to play on my xylophone is "Mary Had a Little Lamb". Would you like to hear it?

Webster Dictionary

1. Xylophone(noun)

   an instrument common among the Russians, Poles, and Tartars, consisting of a series of strips of wood or glass graduated in length to the musical scale, resting on belts of straw, and struck with two small hammers. Called in Germany strohfiedel, or straw fiddle

2. Xylophone(noun)

   an instrument to determine the vibrative properties of different kinds of wood

• xilofoonAfrikaans
• زيلوفون: آلة موسيقيَّهArabic
• ксилофонBulgarian
• xilofonePortuguese (BR)
• xylofonCzech
• das XylophonGerman
• xylofonDanish
• ξυλόφωνοGreek
• xilófonoSpanish
• ksülofonEstonian
• زیلوفونFarsi
• ksylofoniFinnish
• xylophoneFrench
• (מוּזִיקָה) קְסִילוֹפוֹןHebrew
• काष्ठतरंगHindi
• ksilofonCroatian
• xilofonHungarian
• silofonIndonesian
• tréspil, sílófónnIcelandic
• xilofono, silofonoItalian
• 木琴Japanese
• 실로폰Korean
• ksilofonasLithuanian
• ksilofonsLatvian
• zilofonMalay
• xylofoonDutch
• xylofonNorwegian
• ksylofonPolish
• زیلوفونPersian
• زیلوفونPashto
• xilofonePortuguese
• xilofonRomanian
• ксилофонRussian
• xylofónSlovak
• ksilofonSlovenian
• ksilofonSerbian
• xylofonSwedish
• เครื่องดนตรีลักษณะคล้ายระนาดThai
• ksilafon, vurmalı çalgıTurkish
• 木琴，手敲琴Chinese (Trad.)
• ксилофонUkrainian
• چوبی سنتورUrdu
• đàn phiến gỗVietnamese
• 木琴Chinese (Simp.)