NOCTURNAL a. 3 definitions
Of, pertaining to, done or occuring in, the night; as, nocturnal darkness, cries, expedition, etc.; -- opposed to Ant: diurnal. Dryden.
NODAL 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.