Thickening

Full definition of thickening

Noun

1. the process of making something, or becoming, thick or viscous
2. a substance, usually a source of starch, used to thicken a sauce
3. a thickened part of a structure
• Schuster Hepaticae V|6...the inner layer (of nearly equally large cells) lacks the regular semiannular or annular thickenings of most other leafy liverworts...

Verb

1. thickening

   (past of thicken)