† monoplacidadj.
Origin: A borrowing from Greek, combined with English elements. Etymons: mono- comb. form, Greek πλακ- , -id suffix1.
Etymology: < mono- comb. form + ancient Greek πλακ-, πλάξ flat plate, tablet (see placo- comb. form) + -id suffix1. Compare polyplacid adj. at poly- comb. form 1.
Zoology.
Obsolete.
rare. Apparently only attested in dictionaries or glossaries.
1890 Monoplacid, having but one madreporic plate, as a starfish: distinguished from polyplacid.
This entry has been updated (OED Third Edition, December 2002; most recently modified version published online June 2021).