† ˈtree-wormObs. [f. tree n. + worm n.] The teredo or ship-worm. 1398[see Teredo 1].1398Trevisa Barth. De P.R. xviii. cxvi. (Bodl. MS.), A ful tender tre worme þat hatte teredo..& is fulle nasche in kinde & ȝitte he þorleþ moste harde treen.1483Cath.Angl. 393/1 A Tre worme, teredo.