Letter-words

The first part of each of the following words consists of a single letter. What do the words mean?

A-bombatom bomb

E-mail electronic mail

V-formation airplanes flying in the shape of V

T-shirt a short-sleeved vest

V-neck a shirt or vest with V shaped neckline

X-ray electromagnetic radiation

U-turn a 180% turn

T-junction a road junction shaped like a letter T

A-line a narrow, slim-fitting skirt