What is the meaning of the morpheme acr(o)?

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acr(o) denotes the extremities—the far ends or tips of a part. In medical terminology this prefix is used to indicate the outermost points of the body, such as the hands and feet, rather than internal structures. That makes the meaning “ends of a part” the best fit. For instance, terms like acrocyanosis refer to color changes in the extremities due to circulation issues, and acromegaly involves enlargement of the extremities. The other options don’t align with this root: gland would come from aden/o, fat from adip/o or lip/o, and market place from agora-, so they aren’t related to the sense of ends or extremities.