Etymology
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sloe (n.)

fruit of the blackthorn, Old English slah (plural slan), from Proto-Germanic *slaikhwon (source also of Middle Dutch sleeu, Dutch slee, Old High German sleha, German Schlehe), from PIE *sleiə- "blue, bluish, blue-black" (see livid).

The vowel has been influenced by that in the old plural form, which according to OED persisted into the 17c. Scottish slae preserves the older vowel. Sloe-eyed is attested from 1804; sloe gin first recorded 1878.

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Definitions of sloe

sloe (n.)
wild plum of northeastern United States having dark purple fruits with yellow flesh;
Synonyms: Allegheny plum / Alleghany plum / Prunus alleghaniensis
sloe (n.)
a thorny Eurasian bush with plumlike fruits;
Synonyms: blackthorn / Prunus spinosa
sloe (n.)
small sour dark purple fruit of especially the Allegheny plum bush;
From wordnet.princeton.edu