Definition of primary feather in English:

primary feather

Syllabification: pri·ma·ry feath·er

noun

Any of the largest flight feathers in a bird’s wing, growing from the manus.
More 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.

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Word of the day punctum
Pronunciation: ˈpʌŋ(k)təm
noun
a small, distinct point