Is Constructible A Word?

Is Constructible A Word? (of a regular polygon What constructible means? verb (kənˈstrʌkt ) (transitive) to put together substances or parts, esp systematically, in order to make or build (a building, bridge, etc); assemble. to compose or frame mentally (an argument, sentence, etc) Is it Constructable or constructible? As nouns the difference between constructability and