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- The process of making something, or becoming, thick or viscous.
- A substance, usually a source of starch, used to thicken a sauce.
- A thickened part of a structure.
- 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, →ISBN, page 6:
- […] the inner layer (of nearly equally large cells) lacks the regular semiannular or annular thickenings of most other leafy liverworts […]
- 1902, Edwin Hurry Fenwick, Obscure Diseases of the Urethra, page 30:
- They disappear at once on slightly relaxing the air-pressure, whilst true incipient thickenings of the surface remain white and unpliably stiff.
the process of making something, or becoming, thick or viscous
a substance, usually a source of starch, used to thicken a sauce