[1] : The Collaborative International Dictionary of English v.0.48

piperazine \piper"azine\, n. also -zin \-zin\ . piperidine +
   azote + -ine. chem.
   a crystalline substance, c2h4nh2, formed by action of
   ammonia on ethylene bromide, by reduction of pyrazine, etc.
   it is a strong base, and is used as a remedy for gout.
   webster 1913 suppl.
see also:
c2h4nh2 

[2] : The Collaborative International Dictionary of English v.0.48

pyrazine \pyr"azine\, n. also -zin \-zin\ . pyridine + gr. ?
   not + ? life. org. chem.
   a feebly basic solid, c4h4n2, obtained by distilling
   piperazine with zinc dust, and in other ways. also, by
   extension, any of various derivatives of the same.
   webster 1913 suppl.
see also:
c4h4n2 

[3] : Easton's 1897 Bible Dictionary

zin
   a low palm-tree, the south-eastern corner of the desert et-tih,
   the wilderness of paran, between the gulf of akabah and the head
   of the wady guraiyeh num. 13:21. to be distinguished from the
   wilderness of sin q.v..
   

[4] : Hitchcock's Bible Names Dictionary (late 1800's)

zin, buckler; coldness

-Zin >> Z Words
-Zin, definition of term: -Zin
-zin_pag1.html