Etymology
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daylong (adj.)

also day-long, "lasting all day," Old English dæglang; see day + long (adj.).

updated on June 30, 2018

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Definitions of daylong from WordNet
1
daylong (adv.)
during the entire day;
light pours daylong into the parlor
Synonyms: all day long
2
daylong (adj.)
lasting through an entire day;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.