In a triangular fashion in the shape of a triangle
- In a triangular manner; by means of a triangle.
(adv.) In a triangular fashion; in the form of a triangle.
Likewise upon the extreme stern of the boat where it was also triangularly platformed level with the gunwale, Starbuck himself was seen coolly and adroitly balancing himself to the jerking tossings of his chip of a craft, and silently eyeing the vast blue eye of the sea.