Definition

Noun: 1. A small anatomical cavity or sac: In biology and medicine, a follicle is a small, spherical, or sac-like structure, often containing a cavity, that forms part of a gland or serves as a protective enclosure for a cell or other body part. 2. A type of simple dry fruit: In botany, a follicle is a dry fruit that splits open along one seam to release its seeds.

Examples of Usage

• Anatomical/Biological Context:
  • A hair follicle is the structure from which a hair grows.
  • The ovarian follicle contains a developing egg cell.
• Botanical Context:
  • Milkweed plants produce follicles that split open to release seeds with silky hairs.

Advanced Usage

• "Follicular" (Adjective): Pertaining to or of the nature of a follicle.
  • Follicular development is a key stage in the reproductive cycle.
• "Folliculitis" (Noun): Inflammation of one or more hair follicles.
  • Razor bumps are often a form of folliculitis.

Variants and Related Words

• Follicular (adj): Relating to or having the form of a follicle.
• Folliculitis (n): A common skin condition involving inflamed hair follicles.

Synonyms

• Sac: A general term for a pouch or pouch-like structure, often containing fluid.
• Cyst: A closed sac-like structure, typically abnormal, containing liquid or semisolid material. (Note: A follicle is usually a normal structure, while a cyst is often pathological).
• Vesicle: A small fluid-filled bladder, sac, or cyst.

Related Phrases and Terms

• Hair follicle: The specific skin organ that produces hair.
• Ovarian follicle: The fluid-filled structure in the ovary that contains an immature egg (oocyte).
• Thyroid follicle: The spherical structure in the thyroid gland that stores thyroid hormone.

Noun

1. any small spherical group of cells containing a cavity