Sad·dle·back, n.
1. Anything saddle-backed; esp., a hill or ridge having a concave outline at the top.
2. Zool. (a) The harp seal. (b) The great blackbacked gull (Larus marinus). (c) The larva of a bombycid moth (Empretia stimulea) which has a large, bright green, saddle-shaped patch of color on the back.
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