What does "arroyo" mean?

A dry creek or streambed, a gulch which temporarily or seasonally fills and flows (after sufficient rain).

What is a synonym for "arroyo"?

Common synonyms include: abyss, aqueduct, beck, bed, bourn, branch.

/əˈɹɔɪ.oʊ/ name, noun

name, noun ·Moderate ·College level

Noun

1
A dry creek or streambed, a gulch which temporarily or seasonally fills and flows (after sufficient rain).
"Near-synonyms: wadi, nahal"
2
a stream or brook wordnet
3
Any watercourse; any rivulet (whether it flows year-round or only seasonally).

Proper Noun

"The cave is inaccessible during a flash flood because the arroyo turns into a raging river."

Borrowed from Spanish arroyo.