From French 'poudre'. Used for cosmetic or fine powder, often in fashion or historical contexts.
from French poudre
She keeps powder on her dressing table.
Rarely used for flour; modern Japanese normally uses 小麦粉 or 粉. May appear in older or specialized culinary contexts.
Old recipes sometimes say 'プードル' for flour.
Borrowed from French 'poudre', meaning powder. The flour sense likely extended from the powder meaning, but is now largely obsolete.