Definition of estival in English:

estival

(also aestival)

adjective

technical
  • Belonging to or appearing in summer.

    • ‘Geographical variation results in clinal variation triggering aestival dormancy.’
    • ‘In the first study, aestival survival of the plant was tested at two moisture levels.’
    • ‘It is the typical estival weather in Beijing.’
    • ‘He grouped species into ephemeral, aestival, and evergreen.’

Origin

Late Middle English: from Latin aestivalis, from aestivus, from aestus ‘heat’.

Pronunciation