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Definition of Germ tube
1. Noun. (botany) a slender tubular outgrowth from a spore in germination.
Medical Definition of Germ tube
1. A young hypha growing out of a yeast cell or spore, the beginning of a mycelium; also used as a rapid test for differentiating Candida albicans from other Candida species. (05 Mar 2000)