Dictionary of Human Evolution and Biology

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Crown-rump Length

1. distance from the vertex of the skull to the rump (buttocks) of an embryo; the primary estimate of the size of an embryo, used to estimate fertilization age.

2. measurement of sitting height (i.e. length) in children between two and three years of age when the child is lying down, on either a recumbent-length board or table, or a stadiometer; the measurement is made from the vertex of the head to the base of the sacrum.

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