Daito-meaning large sword. A Daito is actually a Katana, though misconceptions say it is larger. The term Daito would be used if the Katana was larger then average, such as Musashi Miyamoto's Katana, since he was well above average height, his Daito was over 30 inches in length, while most Katana's of the time were 26-29 inches.
Daisho -The collection of Katana and Wakizashi, meaning *Big and small*
I bought a Daito of the internet
Musashi weilded his Daito in a no-thought state.