Question: What has a suprasegmental feature known as stød which is a kind of laryngeal phonation that is used phonemically, the first person to describe this in In 1743 was a Danish philologist who wrote several highly insightful treatises on Danish and Latin?

Context paragraphs:
William Thalbitzer: William C. Thalbitzer (February 5, 1873 in Helsingør – September 18, 1958 in Usserød) was a Danish philologist and professor of Eskimo studies at the University of Copenhagen.  He studied Danish, English and Latin at the university, but after graduating in 1899 he decided to focus on "exotic" languages.  In 1900 he spent a year in Ilulissat in western Greenland studying the Greenlandic language.  From 1905 to 1907 he with his wife spent eighteen months among the natives in Tasiilaq, one of the most isolated places on the coast of eastern Greenland.  In 1920 the University of Copenhagen established a permanent lecture position for Thalbitzer in "Greenlandic (Eskimo) language and culture".  In 1952 he was made an honorary doctor at the University of Copenhagen.

Danish phonology: The phonology of Danish is similar to that of the other Scandinavian languages such as Swedish and Norwegian, but it also has distinct features setting it apart from the phonologies of its most closely related languages.  For example Danish has a suprasegmental feature known as stød which is a kind of laryngeal phonation that is used phonemically.  It also exhibits extensive lenition of plosives, which is noticeably more common than in the neighboring languages.  Because of that and a few other things, spoken Danish is rather hard to understand for Norwegians and Swedes, although they can easily read it.

Johan Ludvig Heiberg (historian): Johan Ludvig Heiberg (27 November 1854 – 4 January 1928) was a Danish philologist and historian.  He is best known for his discovery of previously unknown texts in the Archimedes Palimpsest, and for his edition of "Euclid's Elements" that T. L. Heath translated into English.  He also published an edition of Ptolemy's "Almagest".

Jens Høysgaard: Jens Pedersen Høysgaard (December 25, 1698 – April 21, 1773) was a Danish philologist, caretaker at the University of Copenhagen from 1737–1759, and bell-ringer at Trinitatis Church.  In spite of never holding an academic post, he wrote several highly insightful treatises on Danish and Latin.  Today, his work on Danish is considered the best of the early grammatical analyses of the Danish language.  In 1743, he was the first to describe the stød, an important aspect of Danish phonology, in his "Concordia res parvæ crescunt, eller Anden Prøve af Dansk Orthographie", in which he also introduced the letter Å å to the Danish alphabet.

Peder Syv: Peder Pedersen Syv (also spelled Siuf) or in Latin Petrus Petri Septimius (February 22, 1631 – February 17, 1702) was a Danish philologist, folklorist and priest, known for his collections of Danish proverbs and folksongs, and his contributions to the development of Danish as a written language.

Jacob Baden: Jacob Baden (4 May 1735 – 5 July 1804), was a Danish philologist, pedagogue, and critic.  He was professor of rhetoric and the Latin language at University of Copenhagen in 1779.  He was the first person to lecture on Danish grammar at the university between 1782 and 1783,He was the editor of the "University Journal" from 1793 to 1801.

Rasmus Rask: Rasmus Kristian Rask (] ; born Rasmus Christian Nielsen Rasch; sometimes rendered as Erasmus Rask; 22 November 1787 – 14 November 1832) was a Danish linguist and philologist.  He wrote several grammars and worked on comparative phonology and morphology.  Rask traveled extensively to study languages, first to Iceland, where he wrote the first grammar of Icelandic, and later to Russia, Persia, India, and Ceylon (now Sri Lanka).  Shortly before his death, he was hired as professor of Eastern languages at the University of Copenhagen.  Rask is especially known for his contributions to comparative linguistics, including an early formulation of what would later be known as Grimm's Law.

Lis Jacobsen: Elisabeth (Lis) Jacobsen, née Rubin, (1882–1961) was a Danish philologist, archaeologist and writer.  She is remembered first and foremost for her research and publications on the history of the Danish language but she was also an expert runologist who published a comprehensive analysis of all known runic inscriptions in Denmark.  From 1911, Jacobsen played a major role in all fields of research related to the Danish language.

Stød: Stød (] ) is a suprasegmental unit of Danish phonology (represented in IPA as or as ⟨⟩ ), which in its most common form is a kind of creaky voice (laryngealization), but it may also be realized as a glottal stop, especially in emphatic pronunciation.  Some dialects of Southern Danish realize "stød" in a way that is more similar to the tonal word accents of Norwegian and Swedish.  In much of Zealand it is regularly realized as something reminiscent of a glottal stop.  A probably-unrelated glottal stop, with quite different distribution rules, occurs in Western Jutland and is known as the "vestjysk stød" ("West Jutland "stød"").  Because Dania, the phonetic alphabet based on IPA that is designed specifically for Danish, uses the IPA character ⟨⟩ (intended as a glottal stop) broadly to transcribe "stød", it may be mistaken for a consonant, rather than a suprasegmental phonation.

Steven M. Zeitels: Steven Marc Zeitels (born November 7, 1957) is the Eugene B. Casey Professor of Laryngeal Surgery at Harvard Medical School and the Director of Massachusetts General Hospital (MGH) Center for Laryngeal Surgery and Voice Rehabilitation (MGH Voice Center).  He specializes in diseases and disorders of the throat, voice, airway and larynx.  His contributions to voice and laryngeal surgery are highly recognized in the USA and throughout the world.  In 2004, the first endowed Chair in Laryngeal Surgery at Harvard Medical School was created for him while he re-established a Harvard Laryngeal Surgery service at the MGH, which had not been present since the 1920s.  He has received more than 75 awards and honored lectureships for his achievements including the Casselberry Award, DeRoaldes Medal and the Newcomb Award from the American Laryngological Association (founded in 1879).  Zeitels was the 4th surgeon in the organization's history to win all three awards.  He has also received the Chevalier Jackson Award and the annual Broyles Maloney Award (3 times) from the American Broncho-Esophageal Association (founded in 1917), as well as the Distinguished Alumnus Award from the Boston University (BU) School of Medicine in 2007.  Zeitels is also well known for performing complex microsurgery to restore the voices of performing vocalists and has done so on 15 Grammy award winning artists.

Supporting paragraphs: Jens Høysgaard Danish phonology
Answer: phonology of Danish