The Collaborative International Dictionary
Reglet \Reg"let\ (r?g"l?t), n. [F. r['e]glet, dim. of r[`e]gle a rule, L. regula. See Rule.]
(Arch.) A flat, narrow molding, used chiefly to separate the parts or members of compartments or panels from one another, or doubled, turned, and interlaced so as to form knots, frets, or other ornaments. See Illust. (12) of Column.
(Print.) A strip of wood or metal of the height of a quadrat, used for regulating the space between pages in a chase, and also for spacing out title-pages and other open matter. It is graded to different sizes, and designated by the name of the type that it matches; as, nonpareil reglet, pica reglet, and the like.
Wiktionary
n. 1 (context printing English) A strip of wood or metal of the height of a quadrat, used for regulating the space between pages in a chase, and also for spacing out title pages and other open matter. (from 17th c.) 2 (context architecture English) A flat, narrow moulding, used chiefly to separate the parts or members of compartments or panels from one another, or doubled, turned, and interlaced so as to form knots, frets, or other ornaments. (from 17th c.)
Wikipedia
In architecture a reglet is 1.) a thin, flat band relating to mouldings or 2.) a groove in a wall or parapet for receiving the top edge of a flashing. In this usage it is also called a raggle and may be related to regle, a groove. If a flashing is simply applied to a surface then it is called a face reglet.
Flashing reglets secure a receiver counter flashing or the roofing membrane and must contain a sealant to secure the material. The reglet counter flashing allows for the roofing material to be removed for re-roofing.
Usually, in the U.S.A., when reglet is pronounced, the T is not silent. Alternative descriptions used by tradesmen include "rivlet", or "rivulet". In modern, budget construction where low slope roofing and parapets are used, reglet and coping can comprise the majority of flashing costs.
A reglet is a piece of wooden spacing material used in typesetting, usually to provide spacing between paragraphs, though it is sometimes used to fill in small spaces not taken up by type in the chase.
Usage examples of "reglet".
But I was all thumbs in the shop, slow to learn the layout of the frames in which the fonts of type were distributed, clumsy at locking up a forme, messy with ink, a great spoiler of paper, and really not much good at anything but cutting reglet or reading proof, which my father never trusted to anyone but himself in any case.