From The Collaborative International Dictionary of English v.0.44 [gcide]:
Bolus \Bo"lus\, noun; pl. {Boluses}. [L. bolus bit, morsel; cf. G. ? lump of earth. See {Bole}, noun, clay.] A rounded mass of anything, esp. a large pill.
From WordNet (r) 2.0 [wn]:
noun
1: a small round soft mass (as of chewed food)
2: a large pill; used especially in veterinary medicine
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
50 Moby Thesaurus words for "bolus": ball, balloon, bite, bladder, blob, boll, bubble, bulb, bulbil, bulblet, capsule, champ, chaw, chew, chomp, cud, ellipsoid, geoid, globe, globelet, globoid, globule, glomerulus, gnash, gob, gobbet, knob, knot, lozenge, morsel, mouthful, munch, nibble, nip, oblate spheroid, orb, orbit, orblet, pellet, pill, prolate spheroid, quid, rondure, snap, sphere, spheroid, spherule, swallow, tablet, troche
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