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 (symbol âgâ) can be defined as unit of mass. In other words, gram can be described as absolute weight of a volume of pure water equals to (the hundredth part of a meter) 3 and at temperature of melting ice. Gram can also be defined as 1 / 1000 of kilogram (10 -3 kg).