1.NounAn acronym that is usually no longer thought of as such, but instead treated as a regular word and styled in lower case despite its etymological origin.
"When you write about using a waterproof laser pointer while scuba diving, you probably aren’t going to write about “a L.A.S.E.R. pointer for S.C.U.B.A. diving”, because the words laser and scuba are anacronyms."