noun
memento from a deceased person; keepsake; souvenir
A tangible object left behind by someone who has died, kept in memory of them. Often carries emotional weight.
祖母の忘れ形見の指輪を大切にしている。
I treasure the ring that was my grandmother's keepsake.
noun
orphan; posthumous child
A child born after the father's death, or more broadly a child left behind by a deceased parent. Somewhat literary or old-fashioned; 遺児 is more common in modern formal contexts.
彼は戦争で父を亡くした忘れ形見だ。
He is an orphan who lost his father in the war.