IPA: /ˈnɪəsaɪd/
KK: /ˈnɪrˌsaɪd/
The side of something that is closest to the observer or the Earth, often used to refer to the Moon or the left side of a vehicle.
The astronaut took a picture of the nearside of the Moon during the mission.
Nearsides is formed from "near" (from Old English *neah*, meaning close) and "side" (from Old English *side*, meaning a position or surface). The word "nearside" refers to the side that is closest or nearest to something.
Think of something that is 'close' ('near') and the 'side' it is on — that's why 'nearside' means the closest side.