Definition

Noun: A transparent, semi-solid substance made by mixing glycerin and gelatin, used primarily in scientific laboratories for preparing and preserving microscopic specimens on slides.

Usage

This compound noun refers specifically to a prepared mounting medium. It is used as an uncountable mass noun when referring to the substance itself. It is most commonly encountered in technical instructions, supply lists, and scientific reports within fields like histology and biology.

Examples

• The technician prepared a fresh batch of glycerin jelly for the histology lab.
• For this staining procedure, the tissue section must be mounted in glycerin jelly.
• The clarity of glycerin jelly helps preserve specimens without distorting their appearance under the microscope.

Advanced Usage

• As a mounting medium: This is its primary technical function. It implies the substance is used to secure a cover slip over a specimen on a microscope slide, providing a stable, clear, and often preservative environment.
  • The pollen grains were permanently sealed on the slide using glycerin jelly.

Variants and Related Words

• Glycerin (noun): A thick, sweet, colorless liquid (also called glycerol) used as a solvent and moisturizer.
• Gelatin (noun): A translucent, colorless substance derived from collagen, used in food and various industrial applications.
• Mounting medium (noun): The general term for any substance (like glycerin jelly, Canada balsam, or synthetic resins) used to mount specimens on slides.

Synonyms

• Glycerol gelatin (technical synonym)
• Glycerin-gelatin medium (descriptive synonym)

Notes on Meaning

This term has a highly specialized, technical meaning. It does not refer to a food product or a common household item. Its meaning is fixed within the context of laboratory science, specifically microscopic preparation.

Noun

1. a mixture of glycerin and gelatin that is used in histology for mounting specimens