noun

• (archaic) A small, compressed portion of a chemical, drug, food substance, etc.; a pill, a tablet.
  "One of the compartments was found to contain some forty compressed tabloids, which on analysis proved to be potassium bromide."
• (figurative) A compact or compressed version of something; especially something having a popular or sensational nature.
• (figurative) A compact or compressed version of something; especially something having a popular or sensational nature.
  "This boat Mayfay has been admirable as a tabloid cruiser and while Sure Mike is about her same size, Sure Mike is far more nicely modeled; she will not have Mayfay's 17-mile-an-hour homespun plainness."
• (figurative) A compact or compressed version of something; especially something having a popular or sensational nature.
  "[…] Lyle Stuart, […] is known—notorious would be the proper word—for his publishing and writing in the fields of obscenity and extreme leftism: he puts out a sort of tabloid called "The Independent"."

adj

• (figurative) Resembling the style of journalism generally associated with a tabloid newspaper: appealing to unsophisticated people, sensational, etc.
  "tabloid journalism"

verb

• (newspapers) To convert (a newspaper) into a tabloid (noun sense 2.3) format.
  "The ‘tabloiding’ of local newspapers has resulted in a ‘dumbing down’ of the local press. The publication of shorter, brighter, ‘frothier’ stories and the increasing reliance on stories about entertainment, consumer items and ‘human interest’ stories, are the infallible hallmarks of the tabloid genre."