Definition of radicle in US English:



  • 1The part of a plant embryo that develops into the primary root.

    • ‘Roots were determined to have protruded when the radicle had split the endosperm at which point it was clearly visible.’
    • ‘Of seeds that produced radicles, epicotyls emerged in 100% of them following 12 wk of cold stratification and subsequent movement to warmer temperatures.’
    • ‘A caryopsis was considered germinated when the radicle pierced the seed coat, approximately 10 h after the start of imbibition.’
    • ‘The micropyle is the pore through which the radicle emerges during seed germination.’
    • ‘Each week, the leaves were lifted, and seeds with an emerged radicle were counted as germinated and removed from the flats.’
    rhizome, rootstock, tuber, tap root, rootlet
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    1. 1.1Anatomy A rootlike subdivision of a nerve or vein.
      • ‘The parasite radicle then thickens to form a vascular connection - a haustorium - between the parasite and the host.’


Late 17th century: from Latin radicula, diminutive of radix, radic- ‘root’.