geotaxis noun. [dʒi:ǝ(ʊ)'taksɪs] L19.
[from GEO- + -TAXIS.]
Biology. Movement related to the direction of the earth's gravity.
negative geotaxis: in which movement is upwards. positive geotaxis: in which movement is downwards.

■ geotactic adjective of, pertaining to, or of the nature of geotaxis L19.

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