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sesquipedalian (n.)

1610s, "person or thing a foot and a half long," from Latin sesquipedalia "a foot-and-a-half long," from sesqui- "half as much again" (see sesqui-) + stem of pes "foot" (from PIE root *ped- "foot"). As an adjective 1650s. Meaning "sesquipedalian word" (1830) is from Latin sesquipedalia verba "words a foot-and-a-half long," in Horace's "Ars Poetica" (97), nicely illustrating the thing he is criticizing.

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Definitions of sesquipedalian from WordNet
1
sesquipedalian (adj.)
given to the overuse of long words;
this sesquipedalian way of saying one has no money
sesquipedalian orators
sesquipedalian (adj.)
(of words) long and ponderous; having many syllables;
sesquipedalian technical terms
Synonyms: polysyllabic
2
sesquipedalian (n.)
a very long word (a foot and a half long);
Synonyms: sesquipedalia
From wordnet.princeton.edu

Dictionary entries near sesquipedalian

servitude

servo

sesame

sesqui-

sesquicentennial

sesquipedalian

sessile

session

sestet

sestina

set