provector

from The Century Dictionary.

• noun The contravariant operator (a, b, … ∂_ξ, ∂_η,‥)^m, where ∂_ξ, ∂_η, etc., replace x, y, etc., in the quantic (a, b, … x, y, ‥)^m, or any contravariant operator resulting from a similar substitution in any covariant of the original quantic.