Poppy already is singular.
The singular form of "poppies" is "poppy."
The singular form of poppies is poppy.
Papavero is an Italian equivalent of "poppy." The masculine singular noun in question may be preceded by the masculine singular definite article il ("the") or the masculine singular indefinite article un, uno ("a, an"). The pronunciation will be "PA-pa-VEY-ro" in Italian.
The singular form of the word "criteria" is "criterion."
The word 'duo' is the singular form; the plural form is duos.
The singular form of the word flagella is flagellum.
The singular form of the word "señores" is "señor."
That is the singular form; the plural form is those.
'Jackhammer' is the singular form.
The singular form is commando.
The singular possessive form of the word "jury" is "jury's."
The word dog is the singular form.