Also found in: Thesaurus, Medical, Idioms.


adj. thick·er, thick·est
a. Relatively great in extent from one surface to the opposite, usually in the smallest solid dimension; not thin: a thick board.
b. Measuring a specified number of units in this dimension: two inches thick.
2. Heavy in form, build, or stature; thickset: a thick neck.
3. Having component parts in a close, crowded state or arrangement; dense: a thick forest.
4. Having or suggesting a heavy or viscous consistency: thick tomato sauce.
5. Having a great number; abounding: a room thick with flies.
6. Impenetrable by the eyes: a thick fog.
a. Hard to hear or understand, as from being husky or slurred: thick speech.
b. Very noticeable; pronounced: has a thick accent.
8. Informal Lacking mental agility; stupid.
9. Informal Very friendly; intimate: thick friends.
10. Informal Going beyond what is tolerable; excessive.
1. In a thick manner; deeply or heavily: Seashells lay thick on the beach.
2. In a close, compact state or arrangement; densely: Dozens of braids hung thick from the back of her head.
3. So as to be thick; thickly: Slice the bread thick for the best French toast.
1. The thickest part.
2. The most active or intense part: in the thick of the fighting.
thick and thin
Good and bad times: They remained friends through thick and thin.

[Middle English thicke, from Old English thicce; see tegu- in Indo-European roots.]

thick′ish adj.
thick′ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


  • concave lens, convex lens - A concave lens is thinner at the center; a convex lens is thicker at the center.
  • plank, board - A plank is thicker than a board.
  • clotted cream - Cream made thicker and richer by cooking.
  • skin - The term for the thin, tight covering on carrots, potatoes, grapes, and peaches—but also the thicker covering of bananas and avocados.
Farlex Trivia Dictionary. © 2012 Farlex, Inc. All rights reserved.
References in classic literature ?
The dust grew thicker and thicker, and the throats and eyes and noses of the invaders were filled with it.
It grew thicker and thicker, and took the form of little angels, that grew more and more when they touched the earth.
The gaslight which I had left lit for Jonathan, but turned down, came only like a tiny red spark through the fog, which had evidently grown thicker and poured into the room.
The sky of the westerly weather is full of flying clouds, of great big white clouds coming thicker and thicker till they seem to stand welded into a solid canopy, upon whose gray face the lower wrack of the gale, thin, black and angry-looking, flies past with vertiginous speed.
The Grits have it laid on thicker than the Conservatives, that's all--CONSIDERABLY thicker.
First comes white-horse, so called, which is obtained from the tapering part of the fish, and also from the thicker portions of his flukes.
On the other side the yard windows were thrown up, and people were shouting all sorts of things; but I kept my eye fixed on the stable door, where the smoke poured out thicker than ever, and I could see flashes of red light; presently I heard above all the stir and din a loud, clear voice, which I knew was master's:
From the glass windows in the drawing-room, I saw long seaweeds and gigantic fuci and varech, of which the open polar sea contains so many specimens, with their sharp polished filaments; they measured about 300 yards in length-- real cables, thicker than one's thumb; and, having great tenacity, they are often used as ropes for vessels.
They could then see the faint summer fogs in layers, woolly, level, and apparently no thicker than counterpanes, spread about the meadows in detached remnants of small extent.
The result was the entire reconstruction of the navy of both the continents; as the one grew heavier, the other became thicker in proportion.
It is the HONEY in my veins that maketh my blood thicker, and also my soul stiller."--"So will it be, O Zarathustra," answered his animals, and pressed up to him; "but wilt thou not to-day ascend a high mountain?
The nearer it got to noon that day the thicker and thicker was the wagons and horses in the streets, and more coming all the time.