The Chinese word for trumpet is
小号

xiǎo hào

Chinese Definition

trumpet
1. 喇叭；小号
Components
小
1. small, tiny, little
小孩 - child
Antonyms: 大
2. minor, petty
3. briefly, for a short while
小憩 - brief rest
4. slightly, a little
5. young
小狗 - puppy
小貓 - kitten
小羊 - lamb
這嬰兒太小了，不能自己吃東西。 - The baby is too young to feed itself.
Antonyms: 老
6. (the) youngest
小兒子 - youngest son
7. a young person; child, kid, baby
一家老小 - the entire family, old and young
8. Prefix used in front of family name to indicate informality or affection (for young people, 老 for elder people).
For example, Someone called 李國寶／李国宝 can be called 小李.
9. (humble) my, our
小弟 - humble I
小女 - humble my daughter
小的 - humble I
10. Short for 小學 (gloss=primary school)
11. Used in the abbreviation of the name of a primary school.
12. 二Èr 小Xiǎo - No. 2 Primary School
13. Used with a number to indicate the level of primary education.
14. 小一 - P1 (first year in primary school)
15. (dialectal) concubine
16. (Cantonese, minced oath) A euphemism of gloss=to fuck.
小你！ - Duck you!
17. (chiefly Taiwan vulgar) Alternative form of 潲 (siâu), chiefly used in 三小.
号
1. Variant of 號

小號
1. n. (chiefly attributive) small size
2. n. (humble) our store; my store
3. n. (musical instrument) trumpet
4. n. (slang) alternate phone number
5. n. (Internet slang) alternate account
6. n. (Internet slang) sockpuppet
7. v. (colloquial) to have a pee; to do a number one; to take a leak

小号
1. Simplified form of 小號

喇叭
1. n. (musical instrument) horn; trumpet
2. n. (regional, musical instrument) suona
3. n. (zh-alt-name, 揚聲器, loudspeaker; speaker; amplifier)
4. n. (in automobiles etc.) horn
5. n. (figurative) gossiper; one who disseminates information unrestrainedly
6. usage. This is also used as a generic term to describe anything that has a horn or trumpet-like conical shape.