Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A shrewd, tough person.
  • n. A stubborn, unmovable person.
  • n. Any of several fishes having a bony head, especially the Atlantic croaker.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. One who is practical or hardheaded.
  • n. A brown diving duck, Aythya australis, native to Australia.
  • n. Any of various freshwater cyprinid fishes of the genus Mylopharodon, or of saltwater sciaenid (Sciaenidae) fishes.
  • n. Any of several weeds in or formerly classified in the genus Centaurea, particularly russian knapweed (Acroptilon repens).
  • n. Residual ore that failed to melt during a smelting process.
  • n. Clash or collision of heads in contest.

from the GNU version of the Collaborative International Dictionary of English

  • n. Clash or collision of heads in contest.
  • n.
  • n. The menhaden. See Menhaden.
  • n. Block's gurnard (Trigla gurnardus) of Europe.
  • n. A California salmon; the steelhead.
  • n. The gray whale.
  • n. A coarse American commercial sponge (Spongia dura).

from The Century Dictionary and Cyclopedia

  • n. Clash or collision of heads in contest.
  • n. A small billon or copper coin of Scotland, officially known as the lion.
  • n. The menhaden, Brevoortia tyrannus. See cut under Brevoortia.
  • n. The California gray whale, Rhachianectes glaucus: so called by whalers because it has a habit of butting boats.
  • n. The gray gurnard, Trigla gurnardus.
  • n. The ruddy duck, Erismatura rubida, more fully called hard-headed dipper. Also hardtack, toughhead.
  • n. A kind of commercial sponge
  • n. The knapweed, Centaurea nigra: so called from its resemblance to the loggerhead, a ball of iron on a long handle. See knapweed.
  • n. An alloy of iron, tin, and arsenic remaining on the bottom, after liquation, in the process of refining tin in the reverberatory furnace. It is nearly identical in composition with the dross removed from the surface during the operation.
  • n. Alarge, smooth, rounded stone found especially in coarse gravel.
  • n. The name is also applied to many other fishes having hard heads: as in America to Chriodorus atherinoides of the family Hemiramphidæ, and Salmo gairdneri, a trout; in England to Myoxocephalus scorpius, a cottoid fish.
  • n. Inthe Bahamas, a shrub of the spurge family, Phyllanthus Epiphyllanthus. Also called seaside laurel. See laurel, 3.

Etymologies

hard +‎ head (Wiktionary)

Examples

Comments

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  • Also a nickname for the Ruddy Duck. (See dumpling duck, dunker, or dun-curre.)

    January 7, 2009

  • The only true diving duck found in Australasia; feeds by diving deeply, often staying submerged for as long as a minute at a time.

    Or, alternatively, my brother. ;-)

    July 31, 2007