Which prefix means Rainbow?

Which prefix means Rainbow?

• A. Astr-
• B. Phage-
• C. Iris-
• D. Plak-

Answer: (C)

The idea being tested is how prefixes connect to meanings from Greek roots. Rainbow comes from the Greek goddess Iris, and in medical terminology the prefix iris- carries that rainbow association, signaling rainbow-like color or relation to the colored part of the eye. So iris- is the best fit for rainbow, as seen in words describing rainbow colors like iridescent and in terms connected to the iris of the eye. The other options point to different ideas: astr- to stars, phage- to eating or consuming, plak- to plaque or plate.

The idea being tested is how prefixes connect to meanings from Greek roots. Rainbow comes from the Greek goddess Iris, and in medical terminology the prefix iris- carries that rainbow association, signaling rainbow-like color or relation to the colored part of the eye. So iris- is the best fit for rainbow, as seen in words describing rainbow colors like iridescent and in terms connected to the iris of the eye. The other options point to different ideas: astr- to stars, phage- to eating or consuming, plak- to plaque or plate.