Physical. Salmonella bacteria are rod-shaped gram-negative bacteria. Gram-negative bacteria do not retain the crystal violet dye used in the gram staining method due to the fact that they have cell walls that are thin.
Noun. 1. nightie-lingerie consisting of a loose dress designed to be worn in bed by women. nightdress, nightgown, night-robe, gown. intimate apparel, lingerie-women's underwear and nightclothes.
A short nightgown can be called a shortie or a  babydoll , depending on the style. The sweep (taper from top to bottom) of the night gown can vary from virtually straight, to full circle sweep, like the Olga gown pictured below. A slip nightgown may be used as a nightgown or as a full slip.