To make thick or thicker; thicken; specifically, in pharmacy, to make thicker, as a fluid, by the mixture of something less fluid, or by evaporating the more fluid parts.To become thick or thicker.Thickened, or made thick or thicker; inspissated; fattened; swollen from fatness.In botany, becoming thicker by degrees; swelling or swollen.In entomology, gradually swollen in one part, generally toward the apex.