n. A hill or its summit when shaped somewhat like a saddle.n. A bastard kind of oyster, unfit for food; a racoon-oyster.n. The great black-backed gull: same as blackback, 1.n. The harp-seal: so called from the mark on the back.n. A variety of domestic geese, white, with dark feathers on the back like a saddle.n. The larva of the bombycid moth Empretia stimulea: so called on account of the saddle-like markings on the back.n. A coping with a double slope.n. Creadion carunculatus, a passerine bird of New Zealand: so named on account of the chestnut mark on its back.n. A pigeon having a broad mark across the upper part of the back, suggestive of a saddle.Characterized by having a rather steep double slope. Thus, a saddleback roof on a tower is one which has two slopes with a ridge between them and which is bounded at either end by the gable wall. The terra is not often applied to the roofs of large masses of buildings.