epiperipheraladj.

/ˌɛpɪpəˈrɪfərəl/Etymology: < epi- prefix + -peripher- (in periphery n.) + -al suffix1.
1870 H. Spencer (ed. 2) I. ii. vii. 250 Sensations..externally initiated, or epi-peripheral.
This entry has not yet been fully updated (first published 1891; most recently modified version published online March 2018).