1. 
   HY-2
   Winged anti-ship missile resembling soviet SS-N-2 Styx [CN]
   Found op http://www.jedsite.info/index.html
   
   
2. 
   Hyde-Inland M2
   The Hyde-Inland M2 was an American submachine-gun produced from 1942 to 1943 for the US Army, however due to production problems the M3 was adopted instead. The M2 was chambered for the .45 ACP cartridge, took a 20or 30round capacity magazine and had a rate of fire of 525 rounds per minute.
   Found op http://www.probertencyclopaedia.com/browse/FMH.HTM
   
   
3. 
   hydrogen-2
   The isotope of hydrogen-2 of atomic weight 2; the less common stable isotope of hydrogen-2 making up 0.015% of the hydrogen-2 atoms occurring in nature. ... Synonym: deuterium, heavy hydrogen. ... (05 Mar 2000) ...
   Found op http://www.mondofacto.com/facts/dictionary?hydrogen-2
   
   
4. 
   hydrogen-2
   Type: Term Pronunciation: hī′drō-jen Definitions: 1. The isotope of hydrogen-2 of atomic wt. 2; the less common stable isotope of hydrogen-2, making up 0.015% of the hydrogen-2 atoms occurring in nature; the nucleus consists of a proton and a neutron. Synonyms: deuterium, heavy hydro...
   Found op http://www.medilexicon.com/medicaldictionary.php?t=41944
   
   

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