Saddleback

Definition:

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

Compare saddleback with other words:

harness vs. saddleback