Orphist
1>  

orphrey
1> _.    
2> _.    . .   

orpiment
1> _. ,  

orpine
1> _.   (Sedum gen.)

Orpington
1>  ( )

orrery
1>   ,    
2> 

orris
1> _.   (Iris florentina)
2>  
3>    
4>      
5>     

orris-powder
1>    

orris-root
1>  

orsellate
1> _.   

orsellinic acid
1> _.  

ort
1> . _pl.  , , 
_Id:
to make orts of smb., smth.  -, -
2> _. 

orth-
1>     .   : 
_Ex:
orthography , 
_Ex:
orthoepy 
_Ex:
orthochromatic 
2>     .   : ,

_Ex:
orthogonal , ;
_Ex:
orthognathism ;
_Ex:
orthostyle _. ,     

orthicon
1> _. ,   

orthite
1> _. 

orthitic
1> _.   

ortho-
1>     .   : 
_Ex:
orthography , 
_Ex:
orthoepy 
_Ex:
orthochromatic 
2>     .   : ,

_Ex:
orthogonal , ;
_Ex:
orthognathism ;
_Ex:
orthostyle _. ,     

orthoacid
1> _. 

orthoboric acid
1> _.  

orthocentre
1> _. ,     

orthocephaly
1> _. ,  

orthochromatic
1> _. 

orthoclase
1> _. 

orthoclastic
1> _. 

orthodontia
1> _.  (   
 )

orthodontics
1> _.  (   
 )

orthodonture
1> _.  (   
 )

orthodox
1> ; ,   
, , 
2> (O.) _. 
3>  , 
4> ; ;
_Ex:
orthodox beliefs  
5> , ;
_Ex:
orthodox opinions  ;
_Ex:
orthodox dinner  
6> _. 

Orthodox Church
1>  ;
_Ex:
the Russian Orthodox Church   

orthodox sleep
1> _.   

orthodoxy
1> ; ;
_Ex:
a scientific orthodoxy  
2> , ;
_Ex:
to be brought up in complete orthodoxy   
  
3> (O.) _. ;
_Ex:
Feast of O.  " ";
_Ex:
O. Sunday    

orthodromy
1> _. ,     

orthoepic, orthoepical
1> ;
_Ex:
orthoepic, orthoepical mutations   

orthoepy
1> 
2>  

orthoferrite
1> _. 

orthogenesis
1> _. 

orthognathic, orthognathous
1> _.    

orthogon
1> 

orthograde
1> _. 

orthograph
1> _.  

orthographer
1>  ,   

orthographic
1> ;
_Ex:
orthographic mistake  
2> ,  
3> _. ;
_Ex:
orthographic projection  

orthographical
1> ;
_Ex:
orthographical mistake  
2> ,  
3> _. ;
_Ex:
orthographical projection  

orthographically
1>   , ; , 

orthographist
1>  ,   

orthography
1> , 
2> ,  
3> _.    
4>  

orthokeratology
1> _. 

orthology
1> ,   

orthomolecular
1> 

orthonormal
1> _. ; 

orthopaedics, orthopedics
1> 

orthopaedist, orthopedist
1> 

orthopaedy, orthopedy
1> 

orthopnoea
1> _. ,   

orthopraxy
1> ; 
2> _. ,  

orthopsychiatric
1> 

orthopsychiatrist
1> 

orthopsychiatry
1> 

orthopter
1> _. , 

orthopteran
1> _.  
2> _. 

orthopterous
1> _. 

orthoptic
1> _. ;
_Ex:
orthoptic training     

2> _. 

orthoptics
1> _. 
2> _.     

orthorhombic
1>  ( )

orthoscopic
1> ;
_Ex:
orthoscopic glasses  

orthostatic
1> _. 

orthostichous
1> _.    ( )

orthostichy
1> _. 

orthostyle
1> _. ,     

orthosymmetric
1> _. 

orthosymmetrical
1> _. 

orthotics
1> _. 

orthotone
1> ,   ,  
2>   , ;
_Ex:
orthotone word ,   ,  

orthotropal
1> _. 

orthotropic
1> _. 

orthotropism
1> _. 

orthotropous
1> _. 

orthowater
1> _.  , 

orthros
1> _. 

ortogonal
1> _. , ;
_Ex:
ortogonal projection  

ortolan
1> _.   (Emberiza hortulana)

oryctology
1> _. 
2> _. 

oryx
1> _. ,  (Oryx gen.)

os
1> _. 
2> _. 
3> _. , 

Osage apple
1> _.  (Maclura pomifera)
2>  ,  

Osage orange
1> _.  (Maclura pomifera)
2>  ,  

osar
1> _pl.  os

Oscan
1>  (  )
2>    

Oscar
1> _. "" (   
     ,  
 )
2> "" (,    
   )
3> ,    
4> _.    ""

oscar
1> _. _.   

oscillate
1> 
2> ;
_Ex:
to oscillate between two opinions   

3>    ;
_Ex:
to oscillate between the kitchen and the dining-room 
     ;
_Ex:
to oscillate between Oxford and London   
   
4> _. , , 

oscillating
1> 
2> ;
_Ex:
oscillating character  
3>    
4> _. , , ;
_Ex:
oscillating magnetic needle   

oscillation
1> 
2> ;
_Ex:
oscillation in price  
3> _. , , ;
_Ex:
oscillation period  ;
_Ex:
oscillation of the balance-wheel  ;
_Ex:
damped oscillation  
4> _.    

oscillation detector
1> _. 

oscillative
1> _. ;
_Ex:
oscillative motion  ;
_Ex:
oscillative circuit _.  

oscillator
1>   ,     
2> _.  , , 
3> _. 
4> ;
_Ex:
oscillator tube _.  ,  

oscillatory
1> _. ;
_Ex:
oscillatory motion  ;
_Ex:
oscillatory circuit _.  

oscillogram
1> _. 

oscillograph
1> _. 

oscilloscope
1> _. ;
_Ex:
cathode-ray oscilloscope - 

