Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

dame may whitty (also known as mary louise whitty; june 19, 1865 – may 29, 1948) was an english actress.
may whitty

plumbaginaceae is a family of flowering plants are about 560 species in 10 genera found all over the world.
plumbaginaceae

corrosion is the breakdown of materials due to chemical reactions.

corrosion