The following abbreviations are used on this site.

B.Breton
Br.British
c.circa, around
Ccentury (after numbers)
Cconsonant
C.Cornish
cf.compare with
Cu.Cumbric
eearly
E.English
F.French
ggenitive
G.Scottish Gaelic
Gaul.Gaulish
Gk.Greek
I.Irish
llate
L.Latin
MMiddle, Medieval
M.Manx
Modmodern
OOld
ON.Old Norse
PC.Proto-Celtic
PGmc.Proto-Germanic
PIE.Proto-Indo-European
pl.plural
R.River
sg.singular
Vvowel
VL.Vulgar Latin
W.Welsh
‹ ›orthographic form (spelling)
/ /phonemic form (basic sounds)
[ ]phonetic form (detailed sounds)
*hypothetical/reconstructed form
**expected but unattested form
archaic or obsolete
>leads to
<derives from
:cognates