1560s, to remove (a nut, etc.) from a shell, from shell (n.). The meaning to bombard with shells is first attested 1856. To shell out disburse (1801) is a figurative use from the image of extracting nuts. Related: Shelled; shelling.
There are 14 calories in 1 cup, slices (3 oz) of Nopales (Cactus Leaf), raw. You'd need to walk 4 minutes to burn 14 calories. Visit CalorieKing to see calorie count and nutrient data for all portion sizes.
Moreover, the fruit of the Nopal cactus (Prickly Pear) is eaten for arteriosclerosis, diarrhea and a sore throat. (3*) The Nopal cactus (Prickly Pear) pads are also utilized as heating pads to reduce swelling, muscle pains, muscle aches and are also utilized for dressing wounds or cuts.