Definition of vernal adjective from the Oxford Advanced Learner's Dictionary

 

vernal

 adjective
adjective
BrE BrE//ˈvɜːnl//
 
; NAmE NAmE//ˈvɜːrnl//
 
[only before noun](formal or literary)
 
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connected with the season of spring the vernal equinox Word Origin mid 16th cent.: from Latin vernalis, from vernus ‘of the spring’, from ver ‘spring’.
See the Oxford Advanced American Dictionary entry: vernal