perissad

noun
pe·ris·sad | \ pəˈrisəd , -iˌsad \
plural -s

Definition of perissad 

1 obsolete : an element or radical of odd valence

2 : an element of odd atomic number contrasted with artiad

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History and Etymology for perissad

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

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