X-disease

专有名词
中文释义
美 /ˈɛks.dɪ.ziz/

英文释义

专有名词
  1. Any of various diseases of plants or animals whose origin was at first a mystery, especially:; Hyperkeratosis in cattle.
    — In making a diagnosis of X-disease, one must consider the insidious onset, slow course, and number of animals affected.
  2. Any of various diseases of plants or animals whose origin was at first a mystery, especially:; A disease of stone fruits caused by a form of mycoplasma.
    — Transmission of X-disease was more erratic with peach than with chokecherry buds, possibly because only low titers of the X-disease mycoplasma-like organisms (MLO) are present in infected peach trees during most of the year.

词源

From the convention of using "X" as a variable to stand for something unknown.
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