caudal keel
(chiefly in the SCA) A tent, of a style historically used by the Anglo-Saxons, which resembles a shelter-half or pup tent.
(ichthyology) A lateral ridge found just anterior to each side of the tail fin on the caudal peduncle of some types of fast-swimming fish. The keels improve the stability of the fish's attitude at speed in the water, and strengthen the support of the caudal fin.
plural of halloo
(Britain) Someone who drives slowly along roads seeking sex from prostitutes or other women.
マグロのような高速遊泳をする種では、尾柄の両側、尾鰭の直前にある側稜が、高速での姿勢を安定させ、尾鰭の支持を強化します。
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