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allelopathy
allelotoxin
alleluia
allemande
Allen
Allen key
Allen screw
Allen wrench
allene
Allentown
allergen
allergic
allergic alveolitis
allergic dermatitis
allergic purpura
allergic rhinitis
allergist
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allene
al·lene [ ál een ] (plural al·lenes)


noun 
Definition:
 
colorless unstable gas: a colorless unstable gas. Use: manufacture of chemicals. C3H4
[Late 19th century. Contraction of allylene, a gaseous hydrocarbon]
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