[dif-thuh-roid, dip-]
adjective Pathology.
resembling diphtheria, especially in the formation of a false membrane in the throat.
any bacterium, especially of the genus Corynebacterium, that resembles the diphtheria bacillus but does not produce diphtheria toxin.

1860–65; diphther(ia) + -oid

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diphtheroid diph·the·roid (dĭf'thə-roid')

  1. A local infection that resembles diphtheria, especially in the formation of a false membrane, but that is caused by a microorganism other than Corynebacterium diphtheriae. Also called pseudodiphtheria.

  2. Any of various microorganisms resembling Corynebacterium diphtheriae.

diph'the·roid' adj.
The American Heritage® Stedman's Medical Dictionary
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