UNDERN n.
unrise and noon; specifically, the third hour of the day, or nine o'clock in the morning, according to ancient reckoning; hence, mealtime, because formerly the principal meal was eaten at that hour; also, later, the afternoon; the time between dinner and supper. [Obs. or Prov. Eng.] Betwixt undern and noon was the fiel…
UNDULATORY a.
th immense, but measurable, velocities, and producing different impressions on the retina according to their amplitude and frequency, the sensation of brightness depending on the former, that of color on the latter. The undulations are supposed to take place, not in the direction of propagation, as in the air waves con…
VITAL a.
led after a full inspiration. -- Vital force. (Biol.) See under Force. The vital forces, according to Cope, are nerve force (neurism), growth force (bathmism), and thought force (phrenism), all under the direction and control of the vital principle. Apart from the phenomena of consciousness, vital actions no longer ne…
WAVE n.
the same phase occurs. -- Wave line (Shipbuilding), a line of a vessel's hull, shaped in accordance with the wave-line system. -- Wave-line system, Wave-line theory (Shipbuilding), a system or theory of designing the lines of a vessel, which takes into consideration the length and shape of a wave which travels at a c…
WHEEL n.
A turn revolution; rotation; compass. According to the common vicissitude and wheel of things, the proud and the insolent, after long trampling upon others, come at length to be trampled upon themselves. South. [He] throws his steep flight in many an aëry wheel. Milton. A wheel within a wheel, or Wheels within wheels,…