[1] : The Collaborative International Dictionary of English v.0.48

hair \hair\ h^ar, n. oe. her, heer, haer, as. h=aer;
   akin to ofries. h=er, d.  g. haar, ohg.  icel. h=ar,
   dan. haar, sw. har; cf. lith. kasa.
   1. the collection or mass of filaments growing from the skin
      of an animal, and forming a covering for a part of the
      head or for any part or the whole of the body.
      1913 webster

   2. one the above-mentioned filaments, consisting, in
      vertebrate animals, of a long, tubular part which is free
      and flexible, and a bulbous root imbedded in the skin.
      1913 webster

            then read he me how sampson lost his hairs.
                                                  --chaucer.
      1913 webster

            and draweth new delights with hoary hairs.
                                                  --spenser.
      1913 webster

   3. hair human or animal used for various purposes; as, hair
      for stuffing cushions.
      1913 webster

   4. zool. a slender outgrowth from the chitinous cuticle of
      insects, spiders, crustaceans, and other invertebrates.
      such hairs are totally unlike those of vertebrates in
      structure, composition, and mode of growth.
      1913 webster

   5. bot. an outgrowth of the epidermis, consisting of one or
      of several cells, whether pointed, hooked, knobbed, or
      stellated. internal hairs occur in the flower stalk of the
      yellow frog lily nuphar.
      1913 webster

   6. a spring device used in a hair-trigger firearm.
      1913 webster

   7. a haircloth. obs. --chaucer.
      1913 webster

   8. any very small distance, or degree; a hairbreadth.
      1913 webster

   note: hairs is often used adjectively or in combination; as,
         hairbrush or hair brush, hair dye, hair oil, hairpin,
         hair powder, a brush, a dye, etc., for the hair.
         1913 webster

   against the hair, in a rough and disagreeable manner;
      against the grain. obs. "you go against the hair of your
      professions." --shak.

   hair bracket ship carp., a molding which comes in at the
      back of, or runs aft from, the figurehead.

   hair cells anat., cells with hairlike processes in the
      sensory epithelium of certain parts of the internal ear.
      

   hair compass, hair divider, a compass or divider capable
      of delicate adjustment by means of a screw.

   hair glove, a glove of horsehair for rubbing the skin.

   hair lace, a netted fillet for tying up the hair of the
      head. --swift.

   hair line, a line made of hair; a very slender line.

   hair moth zool., any moth which destroys goods made of
      hair, esp. tinea biselliella.

   hair pencil, a brush or pencil made of fine hair, for
      painting; -- generally called by the name of the hair
      used; as, a camel's hair pencil, a sable's hair pencil,
      etc.

   hair plate, an iron plate forming the back of the hearth of
      a bloomery fire.

   hair powder, a white perfumed powder, as of flour or
      starch, formerly much used for sprinkling on the hair of
      the head, or on wigs.

   hair seal zool., any one of several species of eared
      seals which do not produce fur; a sea lion.

   hair seating, haircloth for seats of chairs, etc.

   hair shirt, a shirt, or a band for the loins, made of
      horsehair, and worn as a penance.

   hair sieve, a strainer with a haircloth bottom.

   hair snake. see gordius.

   hair space printing, the thinnest metal space used in
      lines of type.

   hair stroke, a delicate stroke in writing.

   hair trigger, a trigger so constructed as to discharge a
      firearm by a very slight pressure, as by the touch of a
      hair. --farrow.

   not worth a hair, of no value.

   to a hair, with the nicest distinction.

   to split hairs, to make distinctions of useless nicety.
      1913 webster hairball
see also:
nuphar against the hair hair bracket hair cells hair compass hair divider 
hair glove hair lace hair line hair moth tinea biselliella 
hair pencil hair plate hair powder hair seal hair seating 
hair shirt hair sieve hair snake gordius hair space 
hair stroke hair trigger not worth a hair to a hair to split hairs 

[2] : The Collaborative International Dictionary of English v.0.48

split \split\ spli^t, v. t. imp.  p. p. split
   splitted, r.; p. pr.  vb. n. splitting. probably of
   scand. or low german origin; cf. dan. splitte, lg. splitten,
   od. splitten, spletten, d. splijten, g. spleissen, mhg.
   splimaczen. cf. splice, splint, splinter.
   1. to divide lengthwise; to separate from end to end, esp. by
      force; to divide in the direction of the grain or layers;
      to rive; to cleave; as, to split a piece of timber or a
      board; to split a gem; to split a sheepskin.
      1913 webster

            cold winter split the rocks in twain. --dryden.
      1913 webster

   2. to burst; to rupture; to rend; to tear asunder.
      1913 webster

            a huge vessel of exceeding hard marble split asunder
            by congealed water.                   --boyle.
      1913 webster

   3. to divide or break up into parts or divisions, as by
      discord; to separate into parts or parties, as a political
      party; to disunite. colloq. --south.
      1913 webster

   4. chem. to divide or separate into components; -- often
      used with up; as, to split up sugar into alcohol and
      carbonic acid.
      1913 webster

   to split hairs, to make distinctions of useless nicety.
      1913 webster
see also:
split splitted splitting splice splint splinter 
to split hairs 

To Split Hairs >> T Words
To Split Hairs, definition of term: To Split Hairs
to+split+hairs_pag1.html

Split >> S Words
Split, definition of term: Split
split_pag1.html

Split Up >> S Words
Split Up, definition of term: Split Up
split+up_pag1.html

Split Ticket >> S Words
Split Ticket, definition of term: Split Ticket
split+ticket_pag1.html

Split Ring >> S Words
Split Ring, definition of term: Split Ring
split+ring_pag1.html

Split Infinitiv >> S Words
Split Infinitiv, definition of term: Split Infinitiv
split+infinitiv_pag1.html

Split Personali >> S Words
Split Personali, definition of term: Split Personali
split+personali_pag1.html

Reverse Split >> R Words
Reverse Split, definition of term: Reverse Split
reverse+split_pag1.html

Stock Split >> S Words
Stock Split, definition of term: Stock Split
stock+split_pag1.html