1836 Todd Cycl. Anat. &Phys. I. 330/2The auriculo-ventricular orifice is an oblique slit. 
1881 Mivart Cat 273The auriculo-temporal nerve. 
ORIGIN: formed as auricle -o- 
auriculo-
combining form 
Etymology: probably from New Latin, from auricula auricle of the heart, from Latin, external ear — more at auricle 
1. : of or belonging to an auricle of the heart and 
< auriculoventricular >
2. : aural and 
< auriculoparietal >
< auriculotemporal >
1.
< auriculoventricular >
2.
< auriculoparietal >
< auriculotemporal >
auriculo-
Prefix
- Of or pertaining to the auricle. 1836, Robert Bentley Todd (editor), The Cyclopædia of Anatomy and Physiology, first edition, volume 1, “A–DEA”, page 330, column 2:- The auriculo-ventricular orifice is an oblique slit[.]1881, St. George Jackson Mivart, The Cat: An Introduction to the Study of Backboned Animals, Especially Mammals, first edition (John Murray), page 273
- The first of these, the auriculo-temporal nerve, passes backwards, under the external pterygoid muscle, and then upwards between the mandible and the external meatus, underneath the parotid gland.
Etymology
Formed from Latin auricul(a) + English -o-; compare aur-.