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Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Movement of an organism, especially a bacterium, toward or away from air or oxygen.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Movement of an organism either towards or away from a region of higher oxygen content.

from the GNU version of the Collaborative International Dictionary of English

  • n. The positive or negative stimulus exerted by oxygen on aërobic and anaërobic bacteria.

from The Century Dictionary and Cyclopedia

  • n. The movement of cells or organisms in relation to a source or supply of air.

Etymologies

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Examples

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