Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A spongy tissue with large intercellular air spaces that is found in aquatic plants. It provides buoyancy and allows the circulation of gases.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun botany A spongy, airy tissue founds especially in the roots of aquatic plants.

Etymologies

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

[New Latin : aer(o)– + Greek enkhuma, filling (from enkhein, to pour in : en-, in; see en– + khein, to pour; see chyme).]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Latin aer ("air") + -enchyma

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