To make thick or thicker; to thicken; the contrary to attenuate.

In pharmacy, to make fluids thicker by the mixture of other substances less fluid, or by evaporating the thinner parts. Acids dissolve or attenuate; alkalies precipitate or incrassate.

To become thick or thicker.

In botany, thickened or becoming thicker towards the flower, as a peduncle.

Fattened.