2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
 
 
  14.  (Paint.) 
  a  The  representation  or  reproduction  of  the  effect  of 
  the  atmospheric  medium  through  which  every  object  in 
  nature  is  viewed.  --New  Am  Cyc. 
  b  Carriage;  attitude;  action  movement;  as  the  head  of 
  that  portrait  has  a  good  air.  --Fairholt. 
 
  15.  (Man.)  The  artificial  motion  or  carriage  of  a  horse. 
 
  Note:  Air  is  much  used  adjectively  or  as  the  first  part  of  a 
  compound  term.  In  most  cases  it  might  be  written 
  indifferently,  as  a  separate  limiting  word  or  as  the 
  first  element  of  the  compound  term,  with  or  without  the 
  hyphen;  as  air  bladder,  air-bladder,  or  airbladder 
  air  cell,  air-cell,  or  aircell  air-pump,  or  airpump 
 
  {Air  balloon}.  See  {Balloon}. 
 
  {Air  bath}. 
  a  An  apparatus  for  the  application  of  air  to  the  body. 
  b  An  arrangement  for  drying  substances  in  air  of  any 
  desired  temperature. 
 
  {Air  castle}.  See  {Castle  in  the  air},  under  {Castle}. 
 
  {Air  compressor},  a  machine  for  compressing  air  to  be  used  as 
  a  motive  power. 
 
  {Air  crossing},  a  passage  for  air  in  a  mine. 
 
  {Air  cushion},  an  air-tight  cushion  which  can  be  inflated; 
  also  a  device  for  arresting  motion  without  shock  by 
  confined  air. 
 
  {Air  fountain},  a  contrivance  for  producing  a  jet  of  water  by 
  the  force  of  compressed  air. 
 
  {Air  furnace},  a  furnace  which  depends  on  a  natural  draft  and 
  not  on  blast. 
 
  {Air  line},  a  straight  line  a  bee  line  Hence 
 
  {Air-line},  adj.;  as  air-line  road. 
 
  {Air  lock}  (Hydr.  Engin.),  an  intermediate  chamber  between 
  the  outer  air  and  the  compressed-air  chamber  of  a 
  pneumatic  caisson.  --Knight. 
 
  {Air  port}  (Nav.),  a  scuttle  or  porthole  in  a  ship  to  admit 
  air. 
 
  {Air  spring},  a  spring  in  which  the  elasticity  of  air  is 
  utilized. 
 
  {Air  thermometer},  a  form  of  thermometer  in  which  the 
  contraction  and  expansion  of  air  is  made  to  measure 
  changes  of  temperature. 
 
  {Air  threads},  gossamer. 
 
  {Air  trap},  a  contrivance  for  shutting  off  foul  air  or  gas 
  from  drains,  sewers,  etc.;  a  stench  trap. 
 
  {Air  trunk},  a  pipe  or  shaft  for  conducting  foul  or  heated 
  air  from  a  room 
 
  {Air  valve},  a  valve  to  regulate  the  admission  or  egress  of 
  air;  esp.  a  valve  which  opens  inwardly  in  a  steam  boiler 
  and  allows  air  to  enter 
 
  {Air  way},  a  passage  for  a  current  of  air;  as  the  air  way  of 
  an  air  pump;  an  air  way  in  a  mine. 
 
  {In  the  air}. 
  a  Prevalent  without  traceable  origin  or  authority,  as 
  rumors. 
  b  Not  in  a  fixed  or  stable  position;  unsettled. 
  c  (Mil.)  Unsupported  and  liable  to  be  turned  or  taken 
  in  flank;  as  the  army  had  its  wing  in  the  air. 
 
  {To  take  air},  to  be  divulged;  to  be  made  public. 
 
  {To  take  the  air},  to  go  abroad;  to  walk  or  ride  out 
 
  From  WordNet  r  1.6  [wn]: 
 
  airline 
  n  1:  a  hose  that  carries  air  under  pressure 
  2:  a  commercial  enterprise  that  provides  scheduled  flights  for 
  passengers  [syn:  {airline  business},  {airway}] 

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