Which prefix denotes a relationship to hair?

• A. Cephal/o
• B. Ventri/o
• C. Nat/o
• D. Trich/o

Answer: (D)

Hair is indicated by the combining form trich/o. This comes from the Greek thrix, meaning hair, and appears in terms like trichology (the study of hair), trichiasis (hair growing in the wrong direction toward the eye), and trichotillomania (hair-pulling disorder). The other prefixes refer to other body parts or concepts: cephal/o means the head, ventri/o means the belly or abdomen, and nat/o means birth. So, the prefix that denotes a relationship to hair is trich/o.