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spiral arm
noun
Astronomy
.
any of the elongated and curved spiral sections that are connected to the center of a spiral galaxy.
Origin of spiral arm
First recorded in 1910–15
Words nearby spiral arm
spir-
,
spiracle
,
spiradenoma
,
spiraea
,
spiral
,
spiral arm
,
spiral bandage
,
spiral bevel gear
,
spiral binding
,
spiral canal of cochlea
,
spiral canal of modiolus