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.
The gram is a unit of mass in the metric system. It takes 1000 grams to make a kilogram, the basic unit of mass in this more widely accepted system. The name of the pound originates from the Latin term libra pondo, meaning pound weight.. From that Latin term comes the abbreviation for pound, which is lb..