retractile

/ri'træktail/

Thân thiện

A cat's retractile claws are hidden while it walks.

Definition

1. Adjective:
   • Capable of being drawn back or in: Describes something, typically a body part or appendage, that can be pulled back into a body or a sheath. This is often a biological feature for protection or stealth.

Usage

The adjective "retractile" is used to describe a physical capability. It is most commonly applied in biological and anatomical contexts to describe claws, tentacles, or other protrusions that can be withdrawn.

Examples

• Biological Feature:
  • Cats have retractile claws that they can extend for hunting and retract for walking quietly.
  • The snail's eyes are on retractile stalks, allowing it to pull them in if threatened.

Advanced Usage

• Technical/Engineering Context: While less common, "retractile" can describe mechanical parts designed to be drawn back.
  • The aircraft's landing gear is fully retractile into the fuselage.

Variants and Related Words

• Retract (verb): To draw back or in.
  • The cat can retract its claws.
• Retractable (adjective): Often used interchangeably with "retractile," especially for man-made objects.
  • A retractable pen.
  • A retractable roof.
• Retraction (noun): The action of drawing something back or in.
  • The retraction of the landing gear was smooth.

Synonyms

• Retractable: Capable of being retracted (the most direct synonym).
• Withdrawable: Capable of being withdrawn (less common in this specific context).

Antonyms

• Fixed: Immovable, not capable of being drawn in.
• Protractile: Capable of being thrust forward or extended (a direct biological antonym, e.g., a protractile tongue).

Học thuật

Adjective

1. capable of retraction; capable of being drawn back
   • cats have retractile claws