A "tailward" direction when talking about animals
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Caudad refers to a direction towards the tail or lower part of the body. It is the opposite of cephalad, which refers to a direction towards the head or upper part of the body.
The direction of polarization of light is perpendicular to the direction of light propagation.
The direction of polarization is related to the direction of the keyword through the alignment of the electric field vibrations. When the polarization direction matches the keyword direction, the keyword is more likely to be detected accurately.
The direction of the magnetic force on the current in (a) is perpendicular to both the direction of the current and the direction of the magnetic field.
Stationary ascending descending conjunct disjunct
The direction of an object's acceleration is related to the direction of its momentum change. If an object's velocity and acceleration are in the same direction, then the object will speed up. If they are in opposite directions, then the object will slow down. If the acceleration is perpendicular to the velocity, then the object will change direction without changing speed.