What does hyaloid mean?
Hyaloid is a technical term meaning glasslike, transparent, or resembling glass. In ophthalmology, it is most often applied to the hyaloid body, the clear gelatinous vitreous body that fills much of the eye's interior and helps maintain the eyeball's shape. The related term “hyaloid membrane” refers to delicate structures associated with the developing or adult eye, while the obsolete expression “hyaloid artery” denotes a temporary embryonic vessel that supplies the developing eye before the fetal circulation changes. Although its general adjective sense can be understood through words such as “vitreous” and “transparent,” “hyaloid” is most useful when precision about ocular anatomy matters. Outside medical and biological writing, it is uncommon and may sound technical or unfamiliar. Its close relative “hyaline” also means glasslike but has broader applications, including descriptions of minerals, biological tissues, and art materials.
Glasslike or transparent, especially of the vitreous body or other structures of the eye.
"The image revealed a clear separation of the hyaloid body from the retina."
Chiefly used in anatomical and ophthalmological contexts.
The vitreous body of the eye, a transparent gelatinous substance occupying the space between the lens and retina.
"The hyaloid provides support for the retina and helps preserve the shape of the eye."
Uncommon as a standalone noun; the expression “hyaloid body” is more usual.
The plural is rarely needed because the noun is uncommon and normally appears in the fixed expression “hyaloid body.”
"The textbook diagrams compare the developing hyaloids of several vertebrate embryos."
The eye's hyaloid body is a clear, jelly-filled chamber that helps give the eyeball its rounded shape.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does hyaloid come from?
The word combines Greek hualos, meaning “glass,” with the suffix -oeidēs, meaning “like” or “resembling.” It developed into the medical adjective “hyaloid,” originally describing the glasslike vitreous body of the eye. Its relatives “hyaline” and “hyalite” likewise draw on the Greek root for glass, while “hyaluronic” shares the same broad association with a glassy or transparent substance.
How hyaloid is actually used
The adjective is chiefly used in specialized medical contexts. The noun is uncommon outside anatomy and is often encountered as part of the expression “hyaloid body.”
Easily confused with hyaloid
Hyaloid specifically describes the glasslike structures of the eye, whereas hyaline more broadly means glasslike or transparent.