Rigor is something strict, severe or demanding. 1  Harsh and strict treatment in the military for cadets is an example of rigor. 2  Freezing weather and ice are examples of the rigors of winter.  Difficult and challenging academic courses are an example of academic rigor.
The suffix gram means to draw or write. This is used in telegram.
A metric unit of mass equal to 15.432 grains, one thousandth (10-3) of a kilogram, or 0.035 ounce. Gram (grÄm, grÃ¤m), Hans Christian Joachim. 1853-1938. Danish physician who developed (1884) Gram's stain as a method of distinguishing types of bacteria.