J point

J point n.
The point marking the end of the QRS complex and the beginning of the following part that merges into the T wave in an electrocardiogram.

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J/psi particle
[jey-sahy, -psahy] /ˈdʒeɪˈsaɪ, -ˈpsaɪ/ noun, Physics. 1. the lightest of the psi particles, the first particle to be discovered that contains a charmed quark. noun 1. a type of elementary particle (meson) thought to be formed from charmed quarks See charm1 (sense 7) J/psi particle (jā’sī’, -psī’) An electrically neutral meson having a mass 6,060 […]
Jpy
Japan-yen
Jr
1. . 2. . 1. . abbreviation 1. junior Jeremiah junior 1. journal 2. Junior