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twifoil
twifoil n.
Brit. 
/ˈtwʌɪfɔɪl/
, /ˈtwʌɪfɔɪl/U.S. /ˈtwaɪˌfɔɪl/
(also twy-foil) Heraldry = dufoil n./ˈtwaɪˌfɔɪl/ΚΠ
1688 R. Holme Acad. Armory ii. iv. §2. 58 He beareth Argent, a Dufoile or Twyfoile, Vert, flowered, Purpure. The Flower is like that which we commonly call Dogstones,..but more spireing.
c1828 W. Berry Encycl. Her. I. Gloss. Twyfoil or Dufoil.
1891 Cent. Dict. Twifoil.
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