Definition

1. Verb:
   • To fold inward or become folded inward: To turn or be turned inside out, or to fold a part of a structure inward to form a pocket or cavity.
   • To enclose or sheath within a covering: To become or cause to become enclosed in a sheath-like structure.

Examples of Usage

• Verb:
  • During embryonic development, some cells invaginate to form the neural tube.
  • The surgeon had to invaginate the weakened section of the intestinal wall to repair it.
  • The leaf tissue invaginates to create a protective pocket for the insect.

Advanced Usage

• In biology/embryology: Describes a key process in gastrulation where a layer of cells folds inward to form a cavity.
  • The blastula begins to invaginate, forming the archenteron.
• In medicine/surgery: Refers to a technique of inverting a tissue layer.
  • The procedure involves invaginating the appendix stump to prevent leakage.

Variants and Related Words

• Invagination (n): The process or result of invaginating; the formation of a pocket or cavity by inward folding.
  • The invagination of the ectoderm is a critical step.
• Invaginated (adj): Describing something that has undergone invagination.
  • The invaginated membrane forms a distinct pouch.

Synonyms

• Infold: To fold inward.
• Intussuscept: (Medical) To fold or receive within itself; often used specifically for one part of the intestine slipping into another.
• Sheathe: To enclose in a case or covering.

Related Phrases

• Invaginate upon itself: To fold or turn inward onto its own structure.
  • The tubular structure invaginates upon itself to form a double layer.

Verb

1. fold inwards
   • some organs can invaginate
2. sheathe
   • The chrysalis is invaginated