Englishfor English speakers
specialise
Verb
—
If you specialise in something, you are an expert of a particular subject, skill or field.
in
Preposition
—
Used to show that something is inside something else.
The cat is in the box.
—
Used to show that someone is at home, or is available.
Is John in?
The Doctor is now in.
—
Used to show movement towards the inside.
The rain came in through the window.
STH
—
noun
(= somatotropin)
a hormone produced by the anterior pituitary gland; promotes growth in humans
v
Noun
—
The twenty-second (22nd) letter of the alphabet.
"v" comes after "u" and before "w"