Hypertext Webster Gateway: "Nodal"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Nodal \Nod"al\, a.
Of the nature of, or relating to, a node; as, a nodal point.
{Nodal line}, {Nodal point}, in a vibrating plate or cord,
that line or point which remains at rest while the other
parts of the body are in a state of vibration.
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