1A man with a white beard; (hence) an elderly or old man.
2Chiefly Australian. Any of the shrubby plants constituting the Australasian genus Leucopogon (family Epacridaceae), typically having white or pinkish flowers with spreading lobes covered in hairs. Now rare.
Origin
Late Middle English. From white + beard.
Definition of whitebeard in US English:
whitebeard
nounˈwʌɪtbɪəd
1A man with a white beard; (hence) an elderly or old man.
2Chiefly Australian. Any of the shrubby plants constituting the Australasian genus Leucopogon (family Epacridaceae), typically having white or pinkish flowers with spreading lobes covered in hairs. Now rare.