懐剣 is read as かいけん (kaiken) and means dagger.
かいけん
kaiken
かいぎ
doubt
ふところ
space between one's chest and outstretched arms
なつかしい
dear (old)
かいちゅうでんとう
(electric) torch
かいじゅう
winning over
なつかしむ
to yearn for (someone, something)
かいせきりょうり
tea-ceremony dishes
かいちゅうどけい
pocket watch
かいこ
reminiscence
ふところがたな
confidant
かいにん
pregnancy
かいちゅうもの
purse