息の緒 is read as いきのお (iki no o) and means life.
いきのお
iki no o
むすこ
penis
いき
breath
いきぎれ
running out of steam (of the economy, a project, etc.)
いぶき
いきぬき
taking a breather
いきぐるしい
oppressive
いきをひきとる
to die
いきのながい
long-winded
いきがあう
to perform in tune with each other
いきがあがる
to run out of breath
いきのあった
in good coordination
いきをいれる
to take a breather