Crystalloids

Part of speech: noun

Definitions

1. Substances composed of small, soluble particles that readily dissolve in water to form a true solution; often used in medical treatments to replace fluids and electrolytes; characterized by their ability to pass through semipermeable membranes
2. Chemical compounds consisting of fine, uniform particles that disperse completely in solvents creating clear solutions; commonly administered intravenously to manage hydration and electrolyte balance; notable for their permeability through biological membranes
3. Homogeneous mixtures of minute, soluble molecules that dissolve completely in liquids forming stable solutions; typically utilized in clinical contexts for fluid and electrolyte replenishment; distinguished by their capacity to diffuse across cell membranes easily

Etymology: Crystalloids are the plural of "crystalloid", a word built from "crystal" and the suffix "-oid", which means "resembling" or "having the form of". The suffix comes from Greek "eidos", meaning form or shape, so the word literally means something like "crystal-like". The sense is a little surprising. Crystalloids are named for the way a substance behaves when it is dissolved, not for whether it looks like crystal. Crystal-forming substances dissolve into solutions that pass easily through membranes, while colloidal substances such as gelatin or starch do not. The word therefore sorts dissolved substances by how they behave, so a solution can be "crystalloid" even though nothing in it looks crystalline. In medicine, the term is applied to clear saline and similar fluids given intravenously to replace fluid loss. The sense of "clear" in the definition comes from the transparency of these solutions rather than from any crystal structure.

Synonyms: electrolyte solutions, crystal solutions

Antonyms: colloids