The Clue
Skipper, to Barbie (3 letter answer)
The Answer
SIS
Tags
Notes
The answer SIS is seen frequently, appearing about once every 70 puzzles.
Related Clues
Amy, to Chip
Auntie, to Dad
Auntie, to Mom
Bro's counterpart
Bro's sib
Bro's sibling
Cheer starter
Close relative
Fam. member
Family girl
One in the family, informally
Family member
Family nickname
Girl's nickname
Lisa, to Bart
Little lady
MacLaine, to Beatty
Madrid replies
Mom's girl
Parent sharer
Relative, for short
Reunion moniker
Serena, to Venus
Sibling's nickname
Sonny's counterpart
Sonny's sib
Sonny's sibling
Spanish yeses
Apt rhyme for miss
Family member, for short
"___ Hopkins," 1941 film
Latin American agreements
A tot may have a big one
Ray Bradbury's "___ for Space"
Baby brother's baby sitter
Definition
SIS as a noun:
1. (sister, sis) = a female person who has the same parents as another person; "my sister married a musician"
SI as a noun:
1. (Systeme International d'Unites, Systeme International, SI system, SI, International System of Units, International System) = 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); "Today the United States is the only country in the world not totally committed to the Systeme International d'Unites"
2. (silicon, Si, atomic number 14) = 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
3. (ti, te, si) = the syllable naming the seventh (subtonic) note of any musical scale in solmization