Rock (geology)


(1)   Pitching dangerously to one side
(2)   A genre of popular music originating in the 1950s; a blend of Black rhythm-and-blues with White country-and-western
"Rock is a generic term for the range of styles that evolved out of rock'n'roll."
(3)   Hard bright-colored stick candy (typically flavored with peppermint)
(4)   A lump or mass of hard consolidated mineral matter
"He threw a rock at me"
(5)   (figurative) someone who is strong and stable and dependable
"He was her rock during the crisis"
"Thou art Peter, and upon this rock I will build my church"--Gospel According to Matthew
(6)   United States gynecologist and devout Catholic who conducted the first clinical trials of the oral contraceptive pill (1890-1984)
(7)   Material consisting of the aggregate of minerals like those making up the Earth's crust
"That mountain is solid rock"
"Stone is abundant in New England and there are many quarries"


(8)   Move back and forth or sideways
"The ship was rocking"
"The tall building swayed"
"She rocked back and forth on her feet"
(9)   Cause to move back and forth
"Rock the cradle"
"Rock the baby"
"The wind swayed the trees gently"


From , from , from . Cognate with Scots , Dutch , German , Swedish , Danish , Norwegian and (from Indo-European) with Ancient Greek , Russian .


  1. A hard earthen substance that can form large rocks and boulders.
  2. A small piece of stone.
  3. A gemstone, a jewel, especially a diamond.
  4. (plural: stone) A unit of mass equal to 14 pounds. Used to measure the weights of people, animals, cheese, wool, etc. 1 stone ≈ 6.3503 kilograms
    • 1843: Seven pounds make a clove, 2 cloves a stone, 2 stone a tod, 6 1/2 tods a wey, 2 weys a sack, 12 sacks a last. [...] It is to be observed here that a sack is 13 tods, and a tod 28 pounds, so that the sack is 364 pounds. — The Penny Cyclopaedia of the Society for the Diffusion of Useful Knowledge p. 202.
    • 1882: Generally, however, the stone or petra, almost always of 14 lbs., is used, the tod of 28 lbs., and the sack of thirteen stones. — James Edwin Thorold Rogers, A History of Agriculture and Prices in England Volume 4, p. 209.
  5. The central part of some fruits, particularly drupes; consisting of the seed and a hard endocarp layer.
    a peach stone
  6. A hard, stone-like deposit.
    kidney stone
  7. A playing piece made of any hard material, used in various board games such as backgammon, and go.
  8. A dull light grey or beige, like that of some stones.
  9. A 42-pound, precisely shaped piece of granite with a handle attached, which is bowled down the ice.



  1. To pelt with stones, especially to kill by pelting with stones.
  2. To remove a stone from (fruit etc.).
  3. To form a stone during growth, with reference to fruit etc.
  4. To intoxicate, especially with narcotics. (Usually in passive)


  1. Constructed of stone.
    stone walls
  2. Having the appearance of stone.
    stone pot
  3. Of a dull light grey or beige, like that of some stones.
  4. Complete, absolute, of the highest degree.
    stone free


  1. As a stone (used with following adjective).
    My father is stone deaf. This soup is stone cold.
  2. Absolutely, completely (used with following adjective).
    I went stone crazy after she left.

Related terms