Bolus/ˈbəʊləs/ Definition 1 of 4Pro Tip 1/2Digestion Process Refers to food that's been chewed and mixed with saliva, ready for swallowing. After chewing carefully, she swallowed the bolus. Pro Tip 2/2Natural Observation Notice how animals prepare food in their mouths before swallowing, forming a bolus. The cow chewed its cud, forming a bolus.