D defs.my
Entry 1 sense Webster, 1913

Acton

/ăk'-tən/ · Ac·ton · IPA /ˈæk.tən/
01 n. A stuffed jacket worn under the mail, or (later) a jacket plated with mail.
  1. 1.
    A stuffed jacket worn under the mail, or (later) a jacket plated with mail.[Obs.]