toprail

[ top-reyl ]
/ ˈtɒpˌreɪl /

noun

the uppermost rail of the back of a chair or the like; a crest rail.

Origin of toprail

First recorded in 1670–80; top1 + rail1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019