\pˈa͡ɪ mˈiːzɒnz], \pˈaɪ mˈiːzɒnz], \p_ˈaɪ m_ˈiː_z_ɒ_n_z]\
Definitions of PI MESONS
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Short-lived elementary particles found in cosmic radiation or produced from nuclear disintegration. Their mass is between that of protons and electrons and they can be negative, positive, or neutral. pi-Mesons (pions) are heavier than mu-mesons (muons) and are proposed for cancer radiotherapy because their capture and disintegration by matter produces powerful, but short-lived, secondary radiation.
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- Belonging to, or characteristic of, a system of elementary education which combined manual training with other instruction, advocated and practiced by Jean Henri Pestalozzi (1746-1827), Swiss teacher. An advocate or follower the system of Pestalozzi. pes-ta-lot'si-an, adj. pertaining to graduated object-teaching as originated by Johann Heinrich Pestalozzi (1745-1827).