He beareth Sol, an Angel [...]; Wings in Sepurture, Luna: OF some expenced: [...] If the Angels be sideways, and the Wings behind each other, they are termed Sepurture (or Expenced,) yet this [...] is not termed an Angel Sepurture; but an Angel kneeling, the Wings Sepurture. [...] He beareth Or, a demy Angel in Sepurture, Gules [...] This is also termed a demy Angel, half faced, with Wings Sepurture, &c.
1957, African Affairs:
This symbol represented the sepurture wings of an eagle. The wakulu appeared next morning when wearing these symbols of the Feast of the Passover, known to the Tiriki as the tisa ( "nine" or crowned").
mentions clarifying meaning
1828, William Berry, Encyclopaedia Heraldica Or Complete Dictionary of Heraldry, page 9:
Volant sepurture, the same as volant expansed. Volant sepurture, disclosed, nearly the same position as the last, but with the off wing more raised, by which the wings point different ways, which the term sepurture implies. Volant overture, flying with the body in profile[…]
1847, Henry Gough, A Glossary of Terms Used in British Heraldry: With a Chronological Table, Illustrative of Its Rise and Progress, page 281:
SEPURTURE : a term synonymous with endorsed, formerly applied to the wings of birds.
1894, Henry Gough, James Parker, A Glossary of Terms Used in Heraldry, page 626:
Endorsed with its synonym sepurture signifies that the wings are only slightly elevated, but thrown back so as almost to touch [...]
200906, Charles Norton Elvin, A Dictionary of Heraldry, Genealogical Publishing Com, →ISBN, page 115:
Sepurture. The same as Endorsed, as Wings Endorsed, or Sepurture.
1828, William Berry, Encyclopaedia Heraldica, Or Complete Dictionary of Heraldry: Dictionary of Heraldry:
This ancient heraldic term is used in the same way as endorsed, as wings sepurture, or endorsed; they are sometimes termed expansed, expensed, expanded, and disclosed, implying that both wings are behind the head, and one behind[…]
1895, William Dwight Whitney, Benjamin Eli Smith, “The” Century Dictionary: The Century dictionary, page 5503:
In her., raised above the back and opened : noting the wings of a bird : as, a falcon's wings sepurture.
