Y-axis

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Y-ax·is

a cephalometric indicator of the vertical and horizontal coordinates of mandibular growth expressed in degrees of the inferior facial angle formed by the intersection of the sella-gnathion plane with the Frankfort horizontal plane.
Farlex Partner Medical Dictionary © Farlex 2012

Y-ax·is

(aksis)
Cephalometric indicator of vertical and horizontal coordinates of mandibular growth expressed in degrees of inferior facial angle formed by intersection of the sella-gnathion plane with the Frankfurt horizontal plane.
Medical Dictionary for the Dental Professions © Farlex 2012