No one knows the exact cause of psoriasis, but experts believe that itâs a combination of things. Something wrong with the immune system causes inflammation, triggering new skin cells to form too quickly. Normally, skin cells are replaced every 10 to 30 days. With psoriasis, new cells grow every 3 to 4 days. The buildup of old cells being replaced by new ones creates those silver scales.
Wiktionary(0.00 / 0 votes)Rate this definition: 1  abyss(Noun) A bottomless or unfathomed depth, gulf, or chasm; hence, any deep, immeasurable. 2  abyss(Noun) Hell; the bottomless pit; primeval chaos. 3  abyss(Noun) Infinite time; a vast intellectual or moral depth. 4  abyss(Noun) The center of an escutcheon.
Abyssal plain. An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3000 and 6000 m. Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains cover more than 50% of the Earthâs surface.