different between parallelogram vs rhombus

English

Alternative forms

• parallelogramme (archaic)

Etymology

From Latin parallelogrammum, from Ancient Greek ?????????? (paráll?los, “parallel”) + ?????? (gramm?, “line”).

Pronunciation

• (US) enPR: pâ'r?-l?l??-gr?m', IPA^(key): /?pæ.??.?l?l.?.???æm/

Noun

parallelogram (plural parallelograms)

1. (geometry) A convex quadrilateral in which each pair of opposite edges are parallel and of equal length.
2. (Gaelic games, dated) either of two rectangular areas (respectively the large parallelogram and the small parallelogram) abutting the goal line in front of the goal. (Since 1986 officially named the large rectangle and small rectangle, though the older names are still occasionally used.)
   • 1907 GAA, Official Guide "Football Rules"; quoted in Joseph Lennon, The playing rules of football and hurling, 1884-1995 (Northern Recreation Consultants 1997) p.66 ?ISBN:

     2 Marking of ground — [...] A five yard square shall be marked in front of each goal, having the goal posts at adjacent angles. A five yards square shall be marked out in front of each point space, having a goal post and a point post at adjacent angles. There will be thus formed in front of scoring area a parallelogram fifteen yards by five yards.

   • 1981 GAA, The Playing Rules of Football and Hurling; quoted in Joseph Lennon, The playing rules of football and hurling, 1884-1995 (Northern Recreation Consultants 1997) p.358 ?ISBN:

     Two parallelograms of the dimensions set out hereunder shall be formed in front of each scoring space. One parallelogram, 14 mts. by 4.5 mts. shall be formed by two lines 4.5 mts. long and at right angles to the end-line, being marked 3.80 mts. from each goal-post, and the ends of these lines being joined. A larger parallelogram 19 mts. by 13 mts. shall be formed by two lines 13 mts. long and at right angles to the end-line, being marked 6.4 mts. from each goal-post, and the ends of these lines being joined.

   • 2009 June 13, "Classy Cork sink Kerry" GAA website:

     Goulding was fouled in the small parallelogram and O’Connor nicked the penalty into the net off the post.

   • 2011 September 4, Denis Walsh "Cats avoid making same mistakes but Tipp have the right balance" The Sunday Times

     There are seven Kilkenny players inside the large parallelogram and only two from Tipperary. Yet Tipp have scored a goal.

Hypernyms

• (geometry): quadrilateral, quadrangle, tetragon, polygon

Hyponyms

• (geometry): rectangle, rhombus, square, rhomboid

Derived terms

• parallelogram of forces
• parallelogrammatic

Translations

References

Danish

Alternative forms

parallellogram

Noun

parallelogram n (singular definite parallelogrammet, plural indefinite parallelogrammer)

1. (geometry) parallelogram
   • 2006, Q.e.d., Gyldendal Uddannelse ?ISBN, page 72

     Lad ACDB være et parallelogram og BC dets diagonal.

     Let ACDB be a parallelogram and BC its diagonal.

   • 1936, Matematisk tidsskrift

     I et Parallelogram ABCD er trukket en Linie fra A til Midtpunktet M af CD. AM skærer Diagonalen BD i O.

     In a parallelogram ABCD, a line is drawn from A to M, the midpoint of CD. AM intersects with the diagonal, BD, in O.

Declension

English

Etymology

From Latin rhombus, from Ancient Greek ?????? (rhómbos, “rhombus, spinning top”), from ????? (rhémb?, “I turn around”).

Pronunciation

• (UK) IPA^(key): /???mb?s/
• (US) IPA^(key): /????mb?s/

Noun

rhombus (plural rhombi or rhombuses)

1. (geometry) A parallelogram having all sides of equal length. [from 16th c.]
   1. The rhombus diamond, as one of the suits seen in a deck of playing cards ( or ).
2. In early Greek religion, an instrument whirled on the end of a string similar to a bullroarer.
3. (zoology, now rare) Any of several flatfishes, including the brill and turbot, once considered part of the genus Rhombus, now in Scophthalmus. [from 16th c.]
   • 1638, Thomas Herbert, Some Yeares Travels, I:

     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 [...].

4. (zoology, archaic) Snails, now in genus Conus or family Conidae.

Synonyms

• (geometry): diamond (not in technical use), lozenge (if not square), rhomb

Related terms

Derived terms

• rhombus star

Translations

References

• rhombus at OneLook Dictionary Search
• rhombus in The Century Dictionary, New York, N.Y.: The Century Co., 1911.

Latin

Alternative forms

• rombus, rumbus (Medieval Latin)

Etymology

From Ancient Greek ?????? (rhómbos, “rhombus, spinning top”), from ????? (rhémb?, “I turn around”).

Pronunciation

• (Classical) IPA^(key): /?rom.bus/, [?r?mb?s?]
• (Ecclesiastical) IPA^(key): /?rom.bus/, [?r?mbus]

Noun

rhombus m (genitive rhomb?); second declension

1. rhombus (geometry)
2. flatfish
3. (Medieval Latin) sturgeon

   Synonym: sturi?

   Hyponym: carroc?

Declension

Second-declension noun.

Descendants

References

• rhombus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• rhombus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• rhombus in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
• rhombus in Gaffiot, Félix (1934) Dictionnaire illustré Latin-Français, Hachette
• rhombus in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
• rhombus in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin