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reciprocant

reˈciprocant Math.
  [ad. L. reciprocant-em, pres. pple. of reciprocāre to reciprocate.]
  A differential invariant.

1885 Sylvester in Amer. Jrnl. Math. VIII. 199 We are..led..by prosecuting this inquiry to lay the foundations of the theory of Reciprocation or Reciprocants.

  Hence reˈciprocantive a., pertaining to a reciprocant (Cent. Dict. 1891).

Oxford English Dictionary

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