sesqui- +
(Latin: one and a half; normally used as a prefix; from Latin, semis “half” + que “and”)
In chemistry, three atoms or equivalents of the [specified] element or radical are combined with two of another, as in iron sesquioxide, Fe 2O3. Also defined as the proportion of two (of one radical or element) to three (of another).
hippopotomonstrosesquipedalian
A reference to a very, very long word.
hippopotomonstrosesquipedalianism
The use of very, very long words.
hippopotomonstrosesquipedalianist
Someone who uses very, very long words.
hippopotomonstrosesquippedaliophobia
A fear of very long words.
hyperpolysyllabicsesquipedalianist
Anyone who has a fascination for, or who enjoys using, excessively long words.
sesquialteral
One and a half times as great as another; having the ratio of one and a half to one.
sesquicentennial, sesquicentenary
A period of 150 years or occurring every 150 years; relating to or happening after a period of 150 years.
sesquiduplicate
Having the ratio of two and a half to one, or of five to two.
sesquihora
In medicine, every one and a half hours.
sesquilemma
A dilemma in which one choice is less repugnant than the other one.
sesquilingual
1. The difference between being monolingual and bilingual.
2. A situation in which people know one language and part ("half"?) of another one.
—Coined by William Sherk as seen in his "Introduction" to 500 Years of New Words, Doubleday Canada Limited, Toronto, Canada; 1983.
sesquilinguist
Someone who knows one and "a half" languages (or one and "part" of another language).
sesquinona, sesquinonal
In music, a vibration interval of the ratio 10:9; a lesser major second.
sesquioctava, sesquioctaval
In the ratio of nine to eight, or 1 1/8 to 1.
sesquipedal
A thing a foot and a half in length.
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