a european marine fish (belone vulgaris); -- called also gar, gerrick, greenback, greenbone, gorebill, hornfish, longnose, mackerel guide, sea needle, and sea pike.-one of several species of similar fishes of the genus tylosurus, of which one species (t. marinus) is common on the atlantic coast. t. caribbaeus, a very large species, and t. crassus, are more southern; -- called also needlefish. many of the common names of the european garfish are also applied to the american species.