What does hyaloplasm mean?
Hyaloplasm is the clear, gel-like portion of the material inside a cell. In traditional descriptions of cell anatomy, it is distinguished from the more visibly granular parts of the cytoplasm, although the boundaries between these categories are less sharply defined in modern molecular biology. The term is especially associated with the matrix or medium in which a cell's organelles, such as the nucleus, mitochondria, and ribosomes, are suspended. It is primarily used in specialized biological, botanical, and cytological writing rather than everyday speech. Hyaloplasm should not be confused with cytoplasm as a whole: cytoplasm is the broader term, whereas hyaloplasm identifies its historically defined clear matrix. In modern accounts, cytosol is often the more common alternative when the emphasis is on the fluid component of the cell.
nounThe clear, gel-like, non-granular part of cytoplasm, especially the matrix surrounding the cell's organelles.
- The clear, gel-like, non-granular portion of a cell's cytoplasm.
"The organelles are suspended in the cell's hyaloplasm."
"Proteins move through the hyaloplasm as they travel between organelles."
"The specimen was placed in a solution that preserved the hyaloplasm of the damaged cells."
The plural is grammatically regular but is rarely needed because the term is normally used in technical descriptions of individual cells.
"The staining differences between the hyaloplasms of the two cell types were clearly visible."
Hyaloplasm is the cell's clear, glass-like interior medium—the part traditionally distinguished from the densely speckled structures that make up the rest of the cytoplasm.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does hyaloplasm come from?
Hyaloplasm was formed from Greek hýalos, meaning “glass” or “glassy,” and plásma, meaning “formation” or “something formed.” The name reflects the transparent, glass-like appearance of the substance. Its elements also appear in words such as hyaline, hyaloid, and hyaluronic, all of which derive from the same Greek root for glass or glass-like material.
How hyaloplasm is actually used
This is a specialized biological term. It is most common in descriptions of plant and animal cell structure and in older or traditional cytological descriptions; modern molecular biology often uses terms such as cytosol or cytoplasmic matrix instead.
Easily confused with hyaloplasm
Cytoplasm is the entire material inside a cell, whereas hyaloplasm traditionally refers specifically to its clear, non-granular matrix.