The Collaborative International Dictionary of English v.0.48:

Masora \Ma*so"ra\, n. [NHeb. m[=a]s[=o]r[=a]h tradition.]
   A Jewish critical work on the text of the Hebrew Scriptures,
   composed by several learned rabbis of the school of Tiberias,
   in the eighth and ninth centuries. [Written also Masorah,
   Massora, and Massorah.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Massora \Mas*so"ra\, n.
   Same as Masora.
   [1913 Webster]