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.
[…] the inner layer (of nearly equally large cells) lacks the regular semiannular or annular thickenings of most other leafy liverworts […]
present participle and gerund of thicken
Beginning to thicken, becoming thicker.
From Keighley onwards we had obviously returned to civilisation, for the surrounding country was now studded with the sodium street lights of suburbia and a thickening industrial haze was blotting out the moon.
From thicken + -ing.
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