Which combining form means breast?

• A. Mamm/o, mast/o
• B. Kal/o
• C. Lymph/o
• D. Laryng/o

Answer: (A)

Breast is represented by two common combining forms: mamm/o and mast/o. Mamm/o comes from mamma, meaning breast, and you’ll see it in terms like mammogram (an image of the breast) and mammary gland (the breast tissue itself). Mast/o comes from Greek mastos, also meaning breast, and appears in words such as mastitis (inflammation of the breast tissue) and mastectomy (removal of the breast). Both forms convey the same meaning and are used in different word families, which is why either can be the correct answer for “means breast.” The other options refer to lymph or the larynx, not the breast.