Capable of producing something, especially in abundance; fertile.

Yielding good or useful results; constructive.

Of, or relating to the creation of goods or services.

(linguistics, of an affix or word construction rule) Consistently applicable to any of an open set of words.

(medicine) Of a cough, producing mucus or sputum from the respiratory tract.

(medicine) Of inflammation, producing new tissue.

(set theory) A type of set of natural numbers, related to mathematical logic.