a1661 Fuller Worthies (1662) ii. 246wool is..used in making of hats, commonly..called half⁓beavers, though many of them hardly amount to the proportion of semi-demi-castors. [ Rabbits']
1826 J. F. Danneley Mus. Gram. 4The Semidemisemiquaver has four hooks.
1836 T. Hook G. Gurney (1850) III. iii. 351She..at last appeared to expect me at luncheon as regularly as she looked for that semi-demi-dinner itself.
1876 Stainer & Barrett Dict. Mus. Terms,Semidemisemiquaver, a half demisemiquaver, the 64th part of a semibreve.
semi-demi-
word-forming element meaning "sixty-fourth part," 1660s; see semi- + demi-.
ORIGIN: from semi- + demi- .