Definition of pearl:
(adj) :
of or pertaining to pearl or pearls; made of pearls, or of mother-of-pearl
(n) :
a
fringe or
border; hence, figuratively, something resembling a pearl; something very precious
(v) :
to set or adorn with pearls, or with mother-of-pearl. Used also figuratively; to cause to resemble pearls; to make into small round grains; as, to pearl barley