1. 
   Allylene
   Al'ly·lene noun (Chemistry) A gaseous hydrocarbon, C ₃ H ₄ , homologous with acetylene; propine.
   Found op http://www.encyclo.co.uk/webster/A/60
   
   
2. 
   allylene
   <chemistry> A gaseous hydrocarbon, C3H4, homologous with acetylene; propine. ... Source: Websters Dictionary ... (01 Mar 1998) ...
   Found op http://www.mondofacto.com/facts/dictionary?allylene
   
   
3. 
   Allylene
   • (n.) A gaseous hydrocarbon, C3H4, homologous with acetylene; propine.
   Found op http://thinkexist.com/dictionary/meaning/allylene/
   
   

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