epicyclic train definition, epicyclic train meaning | English dictionary

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epicyclic train

  

      n   a cluster of gears consisting of a central gearwheel with external teeth (the sun), a coaxial gearwheel of greater diameter with internal teeth (the annulus), and one or more planetary gears engaging with both of them to provide a large gear ratio in a compact space  
English Collins Dictionary - English Definition & Thesaurus  
Collins
epicycle  
      n  
1      (Astronomy)   (in the Ptolemaic system) a small circle, around which a planet was thought to revolve, whose centre describes a larger circle (the deferent) centred on the earth  
2    a circle that rolls around the inside or outside of another circle, so generating an epicycloid or hypocycloid  
     (C14: from Late Latin epicyclus, from Greek epikuklos; see epi-, cycle)  
   epicyclic         
  epicyclical      adj  

English Collins Dictionary - English Definition & Thesaurus  

Collaborative Dictionary     English Definition
n.
used figuratively, a train crash means something disastrously bad
'this train crash of a policy'
exp.
mess, disaster
It is often used to describe how someone looks or feels. E.g: I'm a train wreck all day if I don't have a cup of coffee.
v.
to train too much, to train excessively
Coaches can't overtrain the athletes before a championship.
v.
to practice something excessively, to train too much
n.
replacement of a rail transport service (tram, subway, train) with a bus
[Neologism] from "bus" and "substitution"
o.
word used to describe the sound made by the wheels of a train
by extension, it can be applied to other rhythmic similar sounds (for example, the sound of a clock or of a typing machine)
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