As we age, the major arteries of our bodies frequently become thickened with plaque, a fatty material with an oatmeal-like consistency that builds up along the inner lining of blood vessels. The reason plaque forms isn’t entirely known, but it seems to be related to high levels of cholesterol inducing an inflammatory response, which can also attract and trap more cellular debris over time.
Used in the Middle of Sentence
Such metalloproteases have been reported as allergen from certain pathogenic molds such as Aspergillus fumigatus (Asp f 5) [38 ] and are popularly known as fungalysins.
These species form a clade within Acrocirridae and were not closely related to either of the two known pelagic cirratuliforms.
These results are clinically relevant because the anteriorisation of posture is known to be injurious, in particular as concerns low-back pain and knee pain.
Used in the Ending of Sentence
Whether it is degraded and newly synthesized or dispersed throughout the cytoplasm and subsequently reaggregated at the spindle is not known.
Mr. Biden’s decision had earthquakelike magnitude in Hillaryland, as Mrs. Clinton’s closest supporters are collectively known.
Meaning of known for the defined word.
Grammatically, this word "known" is an adjective. It's also a noun, more specifically, a countable noun. It's also a verb, more specifically, a verb form.