Having both small rounded sacs and tiny tubes, used to describe certain gland structures in biology.
From Latin 'acinus' (grape or berry-shaped sac) and 'tubulus' (small tube). The term combines two structural features found together in compound glands, particularly in anatomy and histology.
Your salivary glands are actually acinotubular—they have both grape-like clusters that produce saliva and tiny ducts that channel it into your mouth, making them hybrid structures that combine two different shapes in one system.
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