adjective
Origin: L aestivalis < aestivus < aestas, summer < IE base *ai-dh-, to burn: see edify
See estival in American Heritage Dictionary 4
also aes·ti·val
adjectiveOrigin:
Origin: Middle English
Origin: , from Old French
Origin: , from Latin aestīvālis
Origin: , from aestīvus
Origin: , from aestās, summer
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