Etymology
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sundae (n.)

1897, American English, thought to be an alteration of Sunday, perhaps re-spelled in deference to religious feelings; but the reason for the name is uncertain; perhaps "ice cream left over from Sunday, on sale later." For a fuller account of the speculations, see H.L. Mencken, "The American Language," Supplement I (1945), pp.376-7.

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Definitions of sundae

sundae (n.)
ice cream served with a topping;
Synonyms: ice-cream sundae
From wordnet.princeton.edu