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allelochemical
allelomorph
allelopathy
allelotoxin
alleluia
allemande
Allen
Allen key
Allen screw
Allen wrench
allene
Allentown
allergen
allergic
allergic alveolitis
allergic dermatitis
allergic purpura
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Allen screw
Al·len screw (plural Al·len screws)


noun 
Definition:
 
type of screw: a screw with a hexagonal recess in its head that allows it to be turned using an Allen wrench
[Mid-20th century. After the Allen Manufacturing Company of Hartford, Connecticut]
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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