snowdrop

Short definition from Wiktionary

Noun

1. 1
   Any of the 20 species of the genus Galanthus of the Amaryllidaceae, bulbous flowering plants, bearing a solitary, pendulous, white, bell-shaped flower that appears, depending on species, between autumn and late winter or early spring, all native to temperate Eurasia.
2. 2
   Alternative letter-case form of Snowdrop (“a Royal Air Force police officer”).
3. 3
   A Royal Air Force police officer.

Verb

1. 1
   To steal clothing (especially women's underwear) from a clothesline.