What is Ear ?
Ear is (noun) 1. a part of your head which you hear with Rabbits have long ears. Have you washed behind your ears? to be up to your ears in to be very busy with (informal.) He’s up to his ears in work. to have or keep your ear to the ground to follow what is happening and know all about something 2. an ability to sense sound He has a good ear for music. to play an instrument by ear to play without reading the printed notes of music She can play the piano by ear. to play it by ear to do what you think is right at the time (informal.) We won’t make a plan, we’ll just play it by ear and see how it goes. 3. an ear of corn a head of corn with the seeds
source: Easier English, Student Dictionary Upper Intermediate Level