diphtheroid

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diph•the•roid

(ˈdɪf θəˌrɔɪd, ˈdɪp-)

adj.
1. resembling diphtheria, esp. in the formation of a false membrane in the throat.
n.
2. any bacterium, esp. of the genus Corynebacterium, that resembles the diphtheria bacillus but does not produce diphtheria toxin.
[1860–65]