From The Collaborative International Dictionary of English v.0.44 [gcide]:
1. Overfullness; especially, excessive fullness of the blood vessels; repletion; that state of the blood vessels or of the system when the blood exceeds a healthy standard in quantity; hyper[ae]mia; -- opposed to an[ae]mia.
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
71 Moby Thesaurus words for "plethora": amplitude, avalanche, congestion, deluge, embarras de richesses, engorgement, enough, extravagance, extravagancy, flood, flood tide, full, fullness, glut, high tide, high water, hyperemia, impletion, inundation, landslide, lavishness, many, money to burn, more than enough, much, overabundance, overaccumulation, overbounteousness, overbrimming, overburden, overcharge, overcopiousness, overdose, overflow, overfreight, overfullness, overkill, overlavishness, overload, overluxuriance, overmeasure, overmuch, overmuchness, overnumerousness, overplentifulness, overplenty, overplus, overpopulation, overprofusion, overspill, oversufficiency, oversupply, overweight, plenitude, plenty, prodigality, redundancy, repletion, satiety, saturation, saturation point, spate, spring tide, superabundance, superfluity, superflux, supersaturation, surcharge, surfeit, surplus, surplusage
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