Frequency: The word is one of the 3000 most common words in English.
1.
~ is a virus which reduces people’s resistance to illness and can cause AIDS. ~ is an abbreviation for ‘human immunodeficiency virus’.
N-UNCOUNT: oft N n
2.
If someone is ~ positive, they are infected with the ~ virus, and may develop AIDS. If someone is ~ negative, they are not infected with the virus.
PHRASE: v-link PHR