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contraharmonical

ˌcontraharˈmonical, a. Math.
  [contra- 2.]
  Opposed or opposite to harmonical.
  When three numbers are in harmonical progression, then a : c :: ab : bc. The reverse of this, viz. a : c :: bc : ab is termed contra-harmonical proportion.

1727–51 in Chambers Cycl.


  Hence ˌcontraharˈmonically adv.

1727–51 Chambers Cycl. s.v., Thus, e. gr., 3, 5, and 6, are numbers contra-harmonically proportional.

Oxford English Dictionary

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