n.1.An ax with an edge or blade on each side of the handle.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Alfrom bipennis is the causative agent in the other cases of myiasis reported from Turkey including a 29-year old man from Trabzon (4), a 15-year old man from Diyarbakir (2), a 50-year old woman from Eskisehir (3) and a 29-year old man from Kirsehir (14).
Whereas the term "halabarda" is common enough in medieval Latin, the element "-acha" is puzzling, until one becomes aware that it simply represents the French word hache, axe (from the Latin word ascia): a halberd was indeed a combination of a spear and a battle-axe -- a "bipennis," as Erasmus puts it in the same colloquy (606, line 111).
The last theologian mentioned is one "rabinus Druinus." Master Druinus is exposed as a religious legalist who enforces the observance of rigid rules and empty ceremonies ("rabinus") (122) and a scholastic hair-splitter who has ended up in hell: "Eas ad inferos, illic inuenies rabinum Druinum, qui Tenedia bipenni dissecabit omnes tuas quaesriunculas" (ASD, 1, 3: 522, lines 982-83).
the descriptions of Fabius Rusticus and Livy who likened Britain's shape to an ax (bipennis, Tacitus, Agr.