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jack cheese
jack crevalle
Jack Frost
Jack-go-to-bed-at-noon
jack in
jack-in-office
jack-in-the-box
jack-in-the-pulpit
jack ladder
jack mackerel
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J/psi particle
J/psi particle (plural J/psi particles)


noun 
Definition:
 
subatomic particle: an unstable elementary particle of the meson group. It has a large mass, about 6,000 times that of an electron, and is thought to be formed from charmed quarks.
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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