ETYMOLOGY
from pleni- (full) + lunary (pert. to the moon), after Latin plenilunium (full moon)
EXAMPLE
“… whereunto if we adde the two Aegyptian dayes in every moneth, the interlunary and pleniluary exemptions, the Eclipses of Sunne and Moone, conjunctions and oppositions Planeticall, the houses of Planets, and the site of the Luminaries under the signes, (wherein some would induce a restraint of Purgation or Phlebotomy) there would arise aboue an hundred more; …”
From: Pseudodoxia Epidemica, or, Enquiries into very many received tenents and commonly presumed truths;
By Thomas Browne, 1646
Lexicophilia 