The Collaborative International Dictionary
cruth
Crowd \Crowd\, n. [W. crwth; akin to Gael. cruit. Perh. named from its shape, and akin to Gr. kyrto`s curved, and E. curve. Cf. Rote.] An ancient instrument of music with six strings; a kind of violin, being the oldest known stringed instrument played with a bow. [Written also croud, crowth, cruth, and crwth.]
A lackey that . . . can warble upon a crowd a little.
--B. Jonson.
Wiktionary
cruth
n. (alternative form of crwth English)