As Ireland's contribution to the international enterprise of
compiling a "new Du Cange", the Royal Irish Academy has for nearly
a generation been sponsoring the Dictionary of Medieval Latin from
Celtic Sources project. This venture is designed to provide, for
the Celtic territories, the lexicographical coverage of Medieval
Latin that is (for example) coming to be furnished for
German-speaking lands by the Mittellateinisches Wörterbuch, or
for England by the British Academy's well-known DMLBS venture.
NCLCL, the Non-Classical Lexicon of Celtic Latinity (1st volume:
letters A to H), by Anthony Harvey and Jane Power, offers a
detailed, authoritative description, in standard lexicographical
form, of the etymology, meaning and usage of thousands of words
found in the DMLCS electronic archive that are absent altogether
from the Oxford Latin Dictionary, having been coined after the
period covered by that work. NCLCL also embodies a comprehensive
register of words that are found in standard Latin but that appear,
in texts of Celtic provenance, in orthographies or forms that
cannot be accounted for by mainstream European developments in
Medieval Latin.