Lemon oil comes from the Citrus limon tree, from the rind of the same lemon fruit that we eat. Citrus limon trees grow to 15 feet high and are thought to have originated in China and spread to Mediterranean regions.
Full Definition of ACRONYM. : a word (as NATO, radar, or laser) formed from the initial letter or letters of each of the successive parts or major parts of a compound term; also: an abbreviation (as FBI) formed from initial letters: initialism.
Acronym is a hypernym of initialism; acronym was coined in the 40's, initialism in the 60's. Abbreviation is a hypernym of both and has been around as a word much longer. The main distinction of an acronym and initialism is that they compress multiple words, where an abbreviation can be just one word.