impennate

A penguin is an impennate bird.

Definition

1. Adjective:
   • Lacking flight feathers: "impennate" describes a bird that is without the typical feathers required for flight, specifically referring to birds with rudimentary or absent wing feathers, such as those in the order Apterygiformes (e.g., kiwis) or other flightless birds.

Usage Examples

• (A bird lacking flight feathers.)
• (Birds considered flightless due to feather structure.)

Advanced Usage

• "impennate condition": the state of lacking proper flight feathers.
  • The impennate condition in some birds is an adaptation to ground-dwelling lifestyles. (The lack of flight feathers as an evolutionary trait.)

Variants and Related Words

• Impennate (adj): no common variants; the term is technical and rarely used outside ornithology.
• Impennous (adj): a synonym meaning "without feathers" or "flightless."
  • The impennous bird relied on its strong legs for running. (Flightless bird.)

Synonyms

• Flightless: unable to fly.
• Featherless: lacking feathers (though impennate specifically refers to flight feathers, not all feathers).

Related Idioms

• None commonly associated with "impennate"; the term is strictly scientific.

Additional Notes

• Etymology: From Latin (not) + (feather), literally "unfeathered" or "without feathers."
• Usage context: Primarily used in zoological or ornithological texts to describe birds that have lost the ability to fly due to evolutionary reduction of wing feathers.