Self-stimulation of growth in a bacterial culture by addition of similar cells. [G. allelon, mutually, reciprocally, + catalytikos, able to dissolve]

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al·le·lo·ca·tal·y·sis ə-.lel-(.)ō-kə-'tal-ə-səs, -lē-(.)lō- n, pl -y·ses -.sēz the mutually stimulating effect on the rate of growth and reproduction of two or more microorganisms in a volume of medium as compared to the rate of a single microorganism in a like volume of the same medium
al·le·lo·cat·a·lyst -'kat-əl-əst n
al·le·lo·cat·a·lyt·ic -.kat-əl-'it-ik adj

Medical dictionary. 2011.

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