reefable,a.|ˈriːfəb(ə)l| [f. reef v.1 + -able.] Capable of being reefed. 1909Westm.Gaz. 26 Oct. 5/1 Instead of having two rigid planes or wings, set one on either side of the body, it has a single transversal span of canvas which is reefable, like that of the sail of a ship.