Agent noun of expand; someone or something that expands.(noun)
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Use "expander" in a sentence
"I am a medical transcriptionist, and I use a word expander which will produce something like "the patient is here for a followup" if I type "tpihfaf.""
"The automated acronym expander ( "The Bile Machine") generates random, insulting things that any 2-7 letter word can stand for."
"Two years ago I wrote a gist about a new design NASA was testing there—something called an expander cycle engine."