| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024col•loid (kol′oid),USA pronunciation n. - Chemistry[Physical Chem.]a substance made up of a system of particles with linear dimensions in the range of about 10-7 to 5 × 10-5 cm dispersed in a continuous gaseous, liquid, or solid medium whose properties depend on the large specific surface area. The particles can be large molecules like proteins, or solid, liquid, or gaseous aggregates and they remain dispersed indefinitely. Cf. aerosol, emulsion, gel, sol4, suspension.
- Medicinea colloidal substance in the body, as a stored secretion or a cyst.
adj. - Chemistry[Physical Chem.]colloidal.
- Greek kóll(a) glue + -oid
- 1840–50
Collins Concise English Dictionary © HarperCollins Publishers:: colloid /ˈkɒlɔɪd/ n - Also called: colloidal solution, colloidal suspension a mixture having particles of one component, with diameters between 10–7 and 10–9 metres, suspended in a continuous phase of another component. The mixture has properties between those of a solution and a fine suspension
- a gelatinous substance of the thyroid follicles that holds the hormonal secretions of the thyroid gland
Etymology: 19th Century: from Greek kolla glue + -oid |