posterointernal
adjective
pos·tero·in·ter·nal
ˌpäs-tə-rō-in-ˈtərn-ᵊl 
: posterior and internal in position or direction
a posterointernal cusp on a molar
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“Posterointernal.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/posterointernal. Accessed 24 Apr. 2024.
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