noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A rare congenital deformity in which the legs are fused together, giving them the appearance of a mermaid's tail. uncountable

Synonyms

All synonyms

mermaid syndromemermaid syndromemermaidism

Etymology

From Ancient Greek Σειρήν (Seirḗn, “Siren from Greek mythology”) + μέλος (mélos, “limb”) + -εια (-eia, nominal suffix).

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.