Sesquialteral
Pronunciation : Ses`qui*al"ter*al, Ses`qui*al"ter*ate
Part of Speech : a.
Etymology : [L. sesquialter once and a half; sesqui- + alter other: cf. F. sesquialt?re.]
Definition : Defn: Once and a half times as great as another; having the ratio of one and a half to one. Sesquialteral ratio (Math.), the ratio of one and a half to one; thus, 9 and 6 are in a sequialteral ratio.
Source : Webster's Unabridged Dictionary, 1913