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a. A discrete, small unit, such as a subatomic particle: baryon.
b. A property of a physical system when quantized as a particle: phonon.
2. A sequence of nucleotides or region of DNA: codon.
1 suffix meaning an "elementary atomic particle": electron, nucleon, proton.
2 suffix meaning a "unit": magneton, photon.
3 suffix meaning a "(nonmetallic) chemical element": carbon, krypton, silicon.