IPA: /ˈpɪnˌfɛðər/
KK: /ˈpɪnˌfɛðər/
A young feather that is still growing and has not yet fully developed, often found just emerging from the skin of a bird.
The baby bird had several pinfeathers starting to show on its wings.
Pinfeather → The word is formed from "pin" (from Old English "pinn", meaning a small pointed object) and "feather" (from Old English "feðer", meaning the light covering of birds). A pinfeather refers to a young feather that is still developing and has a pin-like structure before it fully matures.
Think of a small pointed object ('pin') that is part of a bird's covering ('feather') — a pinfeather is a young feather that is still growing.