אשׁר
'esher
eh'-sher
From H833; happiness; only in masculine plural construction as interjection, how happy!
KJV Usage: blessed, happy.

Brown-Driver-Briggs' Hebrew Definitions

אשׁר

1. happiness, blessedness
a. often used as interjection
b. blessed are
Origin: from H833
TWOT: 183a
Parts of Speech: Noun Masculine