a leather seat for a rider on a horse 馬鞍 a seat on a bicycle or motorcycle （自行車或摩托車的）車座 
a piece of meat from the back of an animal （動物的）脊肉 a saddle of lamb 羔羊鞍
Word OriginOld English sadol, sadul, of Germanic origin; related to Dutch zadel and German Sattel, perhaps from an Indo-European root shared by Latin sella ‘seat’ and sit.
Idioms
in the saddle
in a position of responsibility, control or authority 擔任領導職務；掌權；在位 It's actually good to be back in the saddle after the holidays. 假期過後回到馬鞍上其實挺好的。 He wanted a united party, with himself firmly in the saddle. 他想要一個團結的政黨，讓自己牢牢地掌權。
riding a horse 騎馬