Hypertext Webster Gateway: "schisma"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Schisma \Schis"ma\, n. [L., a split, separation, Gr. schi`sma:
cf. F. schisma. See {Schism}.] (Anc. Mus.)
An interval equal to half a comma.
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