flint (n.)

Old English flint "flint; a type of rock noted for hardness and for giving off sparks when struck," from Proto-Germanic *flintaz (source also of Middle Dutch vlint, Old High German flins, Danish flint), from PIE *splind- "to split, cleave," from root *(s)plei- "to splice, split" (source also of Greek plinthos "brick, tile," Old Irish slind "brick"), perhaps a variant of *spel- (1) "to split, break off." Transferred senses (hardness, etc.) were in Old English.

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Definitions of flint from WordNet
flint (n.)
a hard kind of stone; a form of silica more opaque than chalcedony;
flint (adj.)
showing unfeeling resistance to tender feelings;
Synonyms: flinty / granitic / obdurate / stony
Flint (n.)
a river in western Georgia that flows generally south to join the Chattahoochee River at the Florida border where they form the Apalachicola River;
Synonyms: Flint River
Flint (n.)
a city in southeast central Michigan near Detroit; automobile manufacturing;