trachelobregmatic diameter

trach·e·lo·breg·mat·ic di·am·e·ter

the diameter of the fetal head from the middle of the anterior fontanelle to the neck.

trach·e·lo·breg·mat·ic di·am·e·ter

(trāk'ĕ-lō-breg-mat'ik dī-am'ĕ-tĕr)
The diameter of the fetal head from the middle of the anterior fontanelle to the neck.