This is not a commonly seen word.
hum·bád
flint
Flint is a hard, very fine-grained quartz, a silica mineral with minor impurities.
A piece of flint is used with steel to produce an igniting spark.
KAHULUGAN SA TAGALOG
humbád: matigas na bató na may silica at sumisiklab kapag ikiniskis sa asero