Kaina

Japanese: かいな

(A word formed by adding the moving final particle "na" to the final particle "kai")① Usage from the early modern period onwards. It expresses a feeling of wanting to confirm something with a sense of doubt. ※Joruri, Shinju Ten no Amijima (1720), Vol. 1 "They say that those who die within ten nights will attain buddhahood, but is that really true? "② (Abbreviation of "So kai na") Is that so? ※Kakuhon, Ukiyofuro (1809-13), Vol. 2 "'But you still say you're slender and slim, aren't you?' 'I don't know. I thought you were losing your cool because of the wind. '"

Kaina

〘Noun〙① Old name of the plant "Kobunagusa (small crucian grass)". [Honsho Wamyo (around 918)]② Old name of the plant "Kariyasu (cutting cheap)". [Jukan Honwamyosho (around 934)]

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:

(終助詞「かい」に感動の終助詞「な」の付いた語)① 近世以後の用法。疑問の意をもって確かめる気持を表わす。※浄瑠璃・心中天の網島（1720）上「十夜の間にしんだ者は仏に成といひますが定(ぢゃう)かひな」② (「さようかいな」の略) そうかね。※滑稽本・浮世風呂（1809‐13）二「『それでもおまへ、ほっそりすうわり柳腰とさへいふじゃアねへか』『かいな。こちゃまた、風負(かざまけ)せいで能(ゑい)かと思ふた』」