Late 19th century. From platy- + ancient Greek ἱερόν, neuter of ἱερός sacred, holy, short for ἱερὸν ὀστέον, corresponding to post-classical Latin os sacrum.
Definition of platyhieric in US English:
platyhieric
adjectiveˌplatɪhʌɪˈɛrɪk
Anthropology rare, historical
Having a sacrum which is broader than it is long.
Origin
Late 19th century. From platy- + ancient Greek ἱερόν, neuter of ἱερός sacred, holy, short for ἱερὸν ὀστέον, corresponding to post-classical Latin os sacrum.