Definitions

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

  • adj. Botany Having the leaf base extending down the stem below the insertion: decurrent leaves.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Pertaining to plant parts that extend downward, most often applied to leaf blades that partly wrap or have wings around the stem or petiole and extend down along the stem.
  • adj. Pertaining to lamellae (the gills of a mushroom) that are broadly attached and extend down the stipe of the mushroom.
  • adj. running or extending downwards.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Extending downward; -- said of a leaf whose base extends downward and forms a wing along the stem.

from The Century Dictionary and Cyclopedia

  • In botany, extending downward beyond the place of insertion: as, a decurrent leaf (that is, a sessile leaf having its base extending downward along the stem). Also decurring.

Etymologies

Middle English, from Latin dēcurrēns, dēcurrent-, present participle of dēcurrere, to run down : dē-, de- + currere, to run; see kers- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin decurrensde ("down") + curro ("to run"). (Wiktionary)

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