Warp wrote:
>   A disc is "round". A torus is "round". A ring is "round". A cylinder is
> "round".
> 
>   Why do they always use "round" to mean "spherical" in this context,
> given that the meaning of the word is not very exact?

Because nobody really believes the earth is a torus or a ring or a 
cylinder? They're trying to distinguish "round" from "flat", not "round" 
from "every other possible shape". :-)

-- 
Darren New / San Diego, CA, USA (PST)
  Ever notice how people in a zombie movie never already know how to
  kill zombies? Ask 100 random people in America how to kill someone
  who has reanimated from the dead in a secret viral weapons lab,
  and how many do you think already know you need a head-shot?

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