Rhombus

//ˈɹɑːmbəs// noun

noun ·Uncommon ·Advanced level

Definitions

Noun
  1. 1
    A parallelogram having all sides of equal length.
  2. 2
    a parallelogram with four equal sides; an oblique-angled equilateral parallelogram wordnet
  3. 3
    A parallelogram having all sides of equal length.; The rhombus diamond, as one of the suits seen in a deck of playing cards ( or ).
  4. 4
    In early Greek religion, an instrument whirled on the end of a string similar to a bullroarer.

    "The Greeks also used an instrument called a rhombus, or witches' wheel. As the wheel spun round, it was thought that influence was gained over certain people or circumstances."

  5. 5
    Any of several flatfishes, including the brill and turbot, once considered part of the genus Rhombus, now in Scophthalmus. archaic

    "the greedy Tuberon or Shark arm'd with a double row of venemous teeth pursues them, directed by a little Rhombus, Musculus or pilot-fish that scuds to and fro to bring intelligence [...]."

Show 1 more definition
  1. 6
    Snails, now in genus Conus or family Conidae. archaic

Synonyms

All synonyms
diamondrhombbullroarerbullroarerdiamondfigure

Example

More examples

"A square is both a rectangle and a rhombus."

Etymology

Learned borrowing from Latin rhombus, from Ancient Greek ῥόμβος (rhómbos, “rhombus, spinning top”). Doublet of rhomb and rhumb.

Related phrases

rhombus starcorrect nameequal sidesfour sidesgeometric shapelike squareslanted squaresquished squarewonky rectangle

More for "rhombus"

SynonymsSentencesPronunciationTranslate

Next best steps

Find stronger synonymsSee usage examplesCheck pronunciationBrowse writing guides

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.