For a while I ponder on some words that I have not been able to find.
I always wondered why, since English is so huge compared to my native Danish where we DO have the following two words:

 1. a word for a 24 hour period. I found the Latin one: [Nychthemeron][1] _It is sometimes used, especially in technical literature, to avoid the ambiguity inherent in the term **day**."_
    
 2. the adjective of solidarity - so we have sympathetic but not solidaric - can anyone tell me why we can be sympathetic to a cause but have to show solidarity?

So is Solidary to Solidarity what Sympathetic is to Sympathy? - Any usage examples?

  [1]: http://en.wikipedia.org/wiki/Nychthemeron