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Lapped miter:
Lapped miters are created when either the fore-edge or the head or tail turn-ins lie one on top of the other at the corners. This is the most frequent corner formation in bindings with both limp covers and covers over boards.
Lay:
A lay person is someone who is not a priest or a member of a religious order.
Lead Point:
A lead point, also known as plummet, is a piece of lead alloy, sometimes contained in a holder; it was the precursor to carbon based graphite. Lead point was primarily used in the eleventh and twelfth centuries.
Leaf:
A single page from a manuscript, it is often detached from the main text.
Light spectrum:
The different wavelengths of energy produced by light.
Limp binding:
A binding composed of parchment, paper, or fabric, without wooden boards. Limp bindings were used during the later Middle Ages and early modern period for less expensive books.
Liturgy:
Rituals or customs prescribed for public worship. At the core of Christian liturgy are the Mass (the celebration of the Last Supper) and the divine office.