extra-
Prefix
Meaning
A Latin preposition, denoting beyond, outside of; -- often used in composition as a prefix signifying outside of, beyond, besides, or in addition to what is denoted by the word to which it is prefixed.
Source: Webster's dictionarySynonyms
ultra-
hyper-
preter-
more
auxiliary
bonus
super-
additional
over-
trans-
para-
spear carrier
added
out-
Antonyms
Examples
Haitao Liu et al, Heart-on-a-Chip Model with Integrated Extra- and Intracellular Bioelectronics for Monitoring Cardiac Electrophysiology under Acute Hypoxia, DOI: 10.1021/acs.