Having an aftershaft; (of a feather) possessing a secondary shaft that runs parallel to the main shaft.
From 'after' + 'shaft' (from Old Norse 'skapt') + '-ed' (past participle suffix). An ornithological term describing feather structure.
Bird feathers aren't simple—many birds have 'aftershafted' feathers with a hidden secondary feather growing from the main shaft, giving them extra insulation and flexibility that's absolutely crucial for flight and warmth.
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