Etymology

twintail

T1W4I1N1T1A1I1L1

Today it means: A variety of goldfish with the tail divided into two parts. Full definition →

Japanese ツインテール
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The story

  1. Japanese · calque ofツインテール
  2. English todaytwintail

From twin + tail. Sense 2 is a calque of Japanese ツインテール (tsuintēru).

Etymology from Wiktionary, CC BY-SA 4.0.