...The functions of thisreceptacle are probably the forming of the food into a bolus, andby a spasmodic contraction the forcing of it back through the gulletinto the mouth for mastication... 
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...If a bolus, withthe other hand pass it over the root of the tongue, and give it a sharppoke downwards...
Dinks, Mayhew, and Hutchinson 「The Dog」
...Calomel, six or eight grains; or, in an obstinate case, Turpeth Mineral orYellow Mercury, six to twelve grains in a bolus...
Dinks, Mayhew, and Hutchinson 「The Dog」
...But to make assurancedoubly sure they deemed it advisable to administer the rest of theashes as a bolus to the animals...
Sir James George Frazer 「Balder The Beautiful, Vol. I.」
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