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  3  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Hydraulics  \Hy*drau"lics\,  n.  [Cf.  F.  hydraulique.] 
  That  branch  of  science,  or  of  engineering,  which  treats  of 
  fluids  in  motion,  especially  of  water,  its  action  in  rivers 
  and  canals,  the  works  and  machinery  for  conducting  or  raising 
  it  its  use  as  a  prime  mover,  and  the  like 
 
  Note:  As  a  science,  hydraulics  includes  hydrodynamics,  or  the 
  principles  of  mechanics  applicable  to  the  motion  of 
  water;  as  a  branch  of  engineering,  it  consists  in  the 
  practical  application  of  the  mechanics  of  fluids  to  the 
  control  and  management  of  water  with  reference  to  the 
  wants  of  man,  including  canals,  waterworks,  hydraulic 
  machines,  pumps,  water  wheels,  etc  Some  writers  treat 
  hydraulics  and  hydrostatics  as  subdivisions  of 
  hydrodynamics. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Mechanics  \Me*chan"ics\,  n.  [Cf.  F.  m['e]canique.] 
  That  science,  or  branch  of  applied  mathematics,  which  treats 
  of  the  action  of  forces  on  bodies. 
 
  Note:  That  part  of  mechanics  which  considers  the  action  of 
  forces  in  producing  rest  or  equilibrium  is  called 
  {statics};  that  which  relates  to  such  action  in 
  producing  motion  is  called  {dynamics}.  The  term 
  mechanics  includes  the  action  of  forces  on  all  bodies, 
  whether  solid,  liquid,  or  gaseous.  It  is  sometimes 
  however,  and  formerly  was  often  used  distinctively  of 
  solid  bodies  only:  The  mechanics  of  liquid  bodies  is 
  called  also  {hydrostatics},  or  {hydrodynamics}, 
  according  as  the  laws  of  rest  or  of  motion  are 
  considered.  The  mechanics  of  gaseous  bodies  is  called 
  also  {pneumatics}.  The  mechanics  of  fluids  in  motion, 
  with  special  reference  to  the  methods  of  obtaining  from 
  them  useful  results,  constitutes  {hydraulics}. 
 
  {Animal  mechanics}  (Physiol.),  that  portion  of  physiology 
  which  has  for  its  object  the  investigation  of  the  laws  of 
  equilibrium  and  motion  in  the  animal  body.  The  most 
  important  mechanical  principle  is  that  of  the  lever,  the 
  bones  forming  the  arms  of  the  levers,  the  contractile 
  muscles  the  power,  the  joints  the  fulcra  or  points  of 
  support,  while  the  weight  of  the  body  or  of  the  individual 
  limbs  constitutes  the  weight  or  resistance. 
 
  {Applied  mechanics},  the  principles  of  abstract  mechanics 
  applied  to  human  art;  also  the  practical  application  of 
  the  laws  of  matter  and  motion  to  the  construction  of 
  machines  and  structures  of  all  kinds. 
 
  From  WordNet  r  1.6  [wn]: 
 
  hydraulics 
  n  :  study  of  the  mechanics  of  fluids  [syn:  {fluid  mechanics}] 

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