Influenza. / (informal) Stomach flu.

(UK) Dated form of flu.

plural of flu

Having a flue or flues (of a specified kind).

Avian influenza.

avian influenza

(informal) industrial action taken by members of the police, claiming sickness en masse.

(Britain, colloquial) A cold or similar ailment as suffered by a male seen as wildly exaggerating the severity of his symptoms. / (Britain, colloquial) A flu or similar ailment as suffered by a male.

(pathology) Alternative form of Spanish influenza

Alternative letter-case form of Spanish flu