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Webster 1913 Edition

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Noun.

[NL., fr. Gr. [GREEK] disturbance, fr.

ὄχλοσ

crowd, mob.]

(Med.)

A general morbid condition induced by the crowding together of many persons, esp. sick persons, under one roof.

G. Gregory.

ochlesis ‎(plural ochleses)

(medicine) Crowd-poisoning; a disease occasioned or aggravated by overcrowding, especially due to lack of ventilation.