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down-and-in
down-and-out
down-at-heel
down-bow
down climbing
Down East
Down Low
down payment
down quark
Down’s syndrome
Down syndrome
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down quark
down quark (plural down quarks)


noun 
Definition:
 
quark with electric charge of -1/3: a quark with an electric charge of -1/3, zero strangeness, and zero charm
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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