出典:Wiktionary
From numerous Latinate feminine agent nouns, re-inforced by Latin -trīx. Note that -rix is not actually a suffix in Latin, only a part of the -trix suffix.
-rix f (複数形 -rices)
メカネヤマネ
lerots
ruts
ミツアナグマ
ratels
rudds
sakis
larks
a wrinkle
wrens
whelks
saigas
a rucksack
heathers
a shield