Piperazine \Pi*per"a*zine\, n. Also -zin \-zin\ . [Piperidine +
   azote + -ine.] (Chem.)
   A crystalline substance, (C2H4NH)2, 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.]

	

	Pyrazine \Pyr"a*zine\, 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.]

	

	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.).

	

	Zin, buckler; coldness