Diameter.

CFR · 2024-01-01 · US · Title 7

When measuring for minimum size, “diameter” means the greatest dimension of the apple measured at right angles to a line from stem to blossom end. When measuring for maximum size, “diameter” means the smallest dimension of the apple determined by passing the apple through a round opening in any position.

official document · source cfr-2024 · id 7:§ 51.320