Definition

1. Adjective:

   • Resembling glass in transparency or translucency; clear, glassy. This describes something that has the visual quality of being very clear and transparent, like glass or a crystal-clear substance.

2. Noun:

   • The transparent membrane enveloping the vitreous humor of the eye and separating it from the retina. In anatomy, this is the specific name for a thin, clear membrane in the eyeball.

Examples of Usage

• Adjective:

  • The hyaloid surface of the lake perfectly reflected the mountains. (The glassy, clear surface of the lake perfectly reflected the mountains.)
  • Under the microscope, the sample had a hyaloid appearance. (Under the microscope, the sample had a glassy, transparent appearance.)

• Noun:

  • The surgeon carefully preserved the hyaloid during the delicate eye operation. (The surgeon carefully preserved the transparent membrane during the delicate eye operation.)
  • A rupture of the hyaloid can lead to visual disturbances. (A rupture of the transparent membrane can lead to visual disturbances.)

Advanced Usage

• "Hyaloid membrane": This is the full anatomical term for the structure. While "hyaloid" alone can function as a noun, it is most precise and commonly used in this compound form in medical contexts.
  • The vitreous humor is contained by the hyaloid membrane.
• "Hyaloid artery": A fetal blood vessel that runs through the vitreous humor to supply the developing lens; it normally degenerates before birth.
  • Persistence of the hyaloid artery is a rare congenital condition.

Variants and Related Words

• Hyaline (adj/n): Closely related, meaning glassy, transparent, or a glassy, translucent substance. "Hyaloid" is often considered a specific type of or related to "hyaline," especially in anatomical contexts.
  • Hyaline cartilage is found in your joints.
• Vitreous (adj): Pertaining to the vitreous humor or body (the gel-like substance in the eye). The hyaloid membrane envelops the vitreous humor.
  • Vitreous detachment is a common age-related change.

Synonyms

• Adjective: Glassy, transparent, clear, crystalline, translucent, limpid.
• Noun: (Hyaloid membrane); there is no common single-word synonym. It is a specific anatomical term.

Notes on Different Meanings

The word hyaloid has two distinct but related meanings: 1. A descriptive quality (adjective): Referring to a glass-like clarity. 2. A specific anatomical structure (noun): A clear membrane in the eye. This is its primary and most technical usage. The adjectival use is less common and often found in literary or scientific descriptions.

Adjective

1. resembling glass in transparency or translucency
   • the morning is as clear as diamond or as hyaline-Sacheverell Sitwell

Noun

1. the transparent membrane enveloping the vitreous humor of the eye and separating it from the retina