tilts is a form of:

Concha



noun
1.
(វេជ្ជសាស្ត្រ) ផ្នែកនៃដងខ្លួនដែលមានរូបរាងដូចសំបកស៊ុត
ENGLISH MEANING
noun
1.
The plain semidome of an apse; sometimes used for the entire apse.
2.
The external ear; esp. the largest and deepest concavity of the external ear, surrounding the entrance to the auditory canal.