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pin feather (s)
, pin feathers (pl) (nouns)
A young feather; especially, one just emerging through the skin and which is still enclosed in a sheath: "Unlike a fully developed feather, the pin feather has a blood supply flowing through it, and so, if the pin feather is damaged, a bird can bleed excessively."
"When chickens moult or their old feathers fall out, theThe new ones start to grow to replace them. The new feathers are known as blood feathers or pin feathers and they resemble porcupine quills and they can stay like that for 5-7 days before the shafts start to flake off and the feathers begin to open and grow."