Definition of primary feather in English:

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primary feather

noun

Any of the largest flight feathers in a bird’s wing, growing from the manus.
Example sentences
  • Like typical swifts, treeswifts have a long manus and primary feathers.
  • It is very agile in flight, helped by broad wings with the primary feathers separated into ‘fingers'.
  • These birds can't fly away because a few primary feathers on one wing are kept clipped.

For editors and proofreaders

Line breaks: pri|mary fea¦ther

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