köken: From Proto-Celtic *natrixs (compare Breton naer, Irish nathair), from Proto-Indo-European *nh₁trih₂ (compare English adder, Latin natrīx (“water snake”)), from *sneh₁- (“to spin, twist”) (compare nyddu). Related to noden (“thread”), nodwydd (“needle”).
aile: blodyn neidr, pwysi nadroedd, gwas y neidr, neidr ddefaid, neidr ddu, neidr fraith, neidr lwyd, neidr wasgu, neidr y domen, neidr y tomennydd
köken: Borrowed from Spanish anaconda, from English anaconda, from New Latin anacandaia, originally referring to a species of constrictor found in Sri Lanka, from Sinhalese හෙනකඳයා (henakaⁿdayā), or Tamil ஆனைக்கொன்றான் (āṉaikkoṉṟāṉ).
Internationalism, possibly borrowed from English anaconda, Spanish anaconda, or Portuguese anaconda, ultimately from New Latin anacandaia (“python”), from Sinhalese හෙනකඳයා (henakaⁿdayā, “whip snake”), from හෙන (hena, “lightning, thunderbolt”) + කඳ (kaⁿda, “stem, trunk, body”). First attested in 1826.