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Allegheny
Allegheny Mountains
Allegheny Plateau
Allegheny spurge
allegiance
allegorical
allegorize
allegory
allegretto
allegro
allele
allelo-
allelochemical
allelomorph
allelopathy
allelotoxin
alleluia
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allergen
al·ler·gen [ állərjən ] (plural al·ler·gens)


noun 
Definition:
 
substance causing allergy: any substance that causes an allergic reaction

al·ler·gen·ic [ àllər jénnik ] adjective
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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