thickened most often of skin
to thicken
• (v. t.) To make thick or thicker; to thicken; especially, in pharmacy, to thicken (a liquid) by the mixture of another substance, or by evaporating the thinner parts. • (a.) Alt. of Incrassated • (v. i.) To become thick or thicker.
<botany> Thickened, of a pollen grain, with thickened margins around the apertures. ... (13 Nov 1997) ... 
In·cras'sate transitive verb [ imperfect & past participle Incrassated ; present participle & verbal noun Incrassating .] [ Latin incrassatus , past participle of incrassare ; prefix in- in + crassus thick.]...
Thickened.
thickened most often of skin