sis

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a female person who has the same parents as another person
noun a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors
noun a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela)

"Uya!" cried Siss, "behold thy portion. — Tales of Space and Time, H. G. (Herbert George) Wells
Form a list of such words as pipe, tote, kick, fife, siss, etc., and severally utter them slowly, holding the final element for a moment, and then letting the breath escape suddenly; then, holding the initial letter firmly for a moment let it come forcibly against the sound of the remainder of the word, producing an abrupt opening, and radical stress of the vowel concrete. — The Ontario Readers: The High School Reader, 1886, Ontario. Department of Education

sister

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