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

agate \agate"\, adv. pref. a- on + gate way.
   on the way; agoing; as, to be agate; to set the bells agate.
   obs. --cotgrave.
   1913 webster

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

agate \ag"ate\, n. f. agate, it. agata, l. achates, fr. gr. ?.
   1. min. a semipellucid, uncrystallized variety of quartz,
      presenting various tints in the same specimen. its colors
      are delicately arranged in stripes or bands, or blended in
      clouds.
      1913 webster

   note: the fortification agate, or scotch pebble, the moss
         agate, the clouded agate, etc., are familiar varieties.
         1913 webster

   2. print. a kind of type, larger than pearl and smaller
      than nonpareil; in england called ruby.
      1913 webster

   note: this line is printed in the type called agate.
         1913 webster

   3. a diminutive person; so called in allusion to the small
      figures cut in agate for rings and seals. obs. --shak.
      1913 webster

   4. a tool used by gold-wire drawers, bookbinders, etc.; -- so
      called from the agate fixed in it for burnishing.
      1913 webster

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

chalcedony \chalced"ony\ ka^lse^d"-ony^ or
   ka^l"s-ed-ony^; 277, n.; pl. chalcedonies
   -ni^z.  l. chalcedonius, fr. gr. chalkhdw`n chalcedon, a
   town in asia minor, opposite to byzantium: cf. calc'edoine,
   oe. calcidoine, casidoyne. cf. cassidony. min.
   a cryptocrystalline, translucent variety of quartz, having
   usually a whitish color, and a luster nearly like wax.
   written also calcedony.
   1913 webster

   note: when chalcedony is variegated with with spots or
         figures, or arranged in differently colored layers, it
         is called agate; and if by reason of the thickness,
         color, and arrangement of the layers it is suitable for
         being carved into cameos, it is called onyx.
         chrysoprase is green chalcedony; carnelian, a flesh
         red, and sard, a brownish red variety.
         1913 webster
see also:
chalcedonies cassidony calcedony agate onyx chrysoprase 
carnelian sard 

[4] : WordNet (r) 2.0

agate
     n : an impure form of quartz consisting of banded chalcedony;
         used as a gemstone and for making mortars and pestles

[5] : Easton's 1897 Bible Dictionary

agate
   heb. shebo, a precious stone in the breast-plate of the high
   priest ex. 28:19; 39:12, the second in the third row. this may
   be the agate properly so called, a semi-transparent crystallized
   quartz, probably brought from sheba, whence its name. in isa.
   54:12 and ezek. 27:16, this word is the rendering of the hebrew
   cadcod, which means "ruddy," and denotes a variety of minutely
   crystalline silica more or less in bands of different tints.
   
     this word is from the greek name of a stone found in the river
   achates in sicily.
   

[6] : U.S. Gazetteer (1990)

agate, co
  zip codes: 80101

Agate >> A Words
Agate, definition of term: Agate
agate_pag1.html

Agate Line >> A Words
Agate Line, definition of term: Agate Line
agate+line_pag1.html