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.
Gram (g) Gram (g), also spelled gramme, unit of mass or weight that is used especially in the centimetre-gram-second system of measurement (see International System of Units). One gram is equal to 0.001 kg.