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perissad

noun pe·ris·sad \ pəˈrisəd , -iˌsad \

Definition of perissad

plural -s
1 obsolete :an element or radical of odd valence
2 :an element of odd atomic number —contrasted with artiad

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Origin and Etymology of perissad

Greek perissos beyond the regular number or size, superfluous, excessive, uneven (from peri around, beyond) + English -ad

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