from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. In military fortification, a trench or ditch covered with a parapet that provides communication between two trenches, particularly the rear and front lines. Boyaus were typically constructed in a zigzag pattern to prevent exposure to direct enemy fire from the front.
- n. A line, drawn winding about, in order to enclose several tracts of land, or to attack some works.
from the GNU version of the Collaborative International Dictionary of English
- n. A winding or zigzag trench forming a path or communication from one siegework to another, to a magazine, etc.
from The Century Dictionary and Cyclopedia
- n. In fort, a ditch covered with a parapet, serving as a means of communication between two trenches, especially between the first and third parallels. Also called a zigzag or an approach.
We have no direct evidence how the embryo is formed, yet no one doubts but that it is brought about by the agency of the boyau, which is a cell containing grumous molecular matter.
Just as we neared the crest of the hill, at a notice bearing the legend, "Keep below," the whole party entered a deep "boyau" leading right up to the trenches in front, from which branched off various passages to the gun pits, or butts, as we used to call them.
_Jacques Martin, soldat au 170e d'infanterie, grenadier d'élite, au cours des combats du 26 et du 27 novembre, 1916, a, par son mépris du danger et par son ardeur, assuré la progression dans un boyau défendu pas à pas par l'ennemi.
We were walking along a country lane to a turning where a trench boyau began.
The embryonary sac of Phaenogams does not always exist at the time of application of the boyau, and the appearance of the embryo is always posterior to this.
As well might they doubt the necessity of the application of the boyau to an ovule, (or the existence of the boyau itself,) because the derivation of the embryo cannot be proved.
However different a boyau may seem to many, yet when viewed in conjunction with Cycadeae, the graduation to the present case becomes natural, and even the resemblance may be perfect, because in Cycas the grains of pollen get into the nucleus bodily, although they would still seem to throw out short tails.
I shall be very anxious to know what your opinion is, particularly with regard to the tubes and all adhering filaments; the question now occupying botanists, being this, is the embryo derived directly from the boyau or is it derived from some parts of the ovulum?
Arrangements for passage of men moving in opposite directions may be made by extending short spurs at the corners, enlarging the boyau at the bends, digging niches or passing points here and there, or constructing island traverses with the boyau running around on each side.
Bombing stations are placed near by to protect the guns and to clear the boyau of the enemy.