Definition of diel in English:

diel

adjective

Biology
  • Denoting or involving a period of twenty-four hours.

    ‘tidal and diel cycles’
    • ‘Two additional cruises were conducted during calm periods to determine diel variation in the vertical distribution of C. concholepas competent larvae.’
    • ‘Water movement and diel cycles of internal water distribution between water-storage hydrenchyma and photosynthetic chlorenchyma has also been demonstrated for A. deserti, Ferocactus acanthodes and Opuntia ficus-indica.’
    • ‘Specimens were collected over a broad range of times to ensure that foods consumed throughout the diel cycle were represented.’
    • ‘The tagging data are providing new insights into the seasonal movements, diel thermal body temperature cycles, feeding energetics and habitat utilization of Pacific bluefin tuna.’
    • ‘That correlation may also occur because gulls follow diel cycles of puffin activity attacking most often in the morning when puffin returns are likely to be highest.’

Origin

1930s from Latin dies ‘day’ + -(a)l (see -al).

Pronunciation

diel

/ˈdiːl/