monograph

noun

Etymology: From mono- (“one”) + -graph (“write”).

A scholarly book or a treatise on a single subject or a group of related subjects; especially, such a document that is written by one person.
“It may still be years before we see, what we all look forward to, the great and final book on Knossos. Meanwhile learned monographs on different sections of the subject have been fast accumulating. They form the principal contents of six successive Annuals of the British School at Athens, and a not inconsiderable portion of the six corresponding volumes of The Journal of Hellenic Studies.”
“The complex history of the Wirral Railway and the lines with which it was interlinked needs more lucid treatment than is given in this 39-page monograph - and clearer maps and an index.”
A nonserial (nonperiodical) publication: a one-time publication.
A single letter, especially one which represents a phoneme by itself.

Etymology: From mono- (“one”) + -graph (“write”).

To write a monograph on (a subject).
“It is among the most studied, monographed, celebrated and sent-up works of modern art, and perhaps as influential as any from the last century.”
Of the FDA: to publish a standard that authorizes the use of (a substance).