quadrantile
quadrantal

quadrantlike
Resembling or characteristic of a quadrant.

quadrapartite
Alternative spelling of quadripartite.

quadraphonic
Employing four independent channels or speakers.

quadraphony
Sound, in a sound system, originating from four speakers.

quadraplex
Misspelling of quadruplex.

quadrasonic
quadraphonic

quadratfrei
Synonym of squarefree.

quadratic
Square-shaped.
Of a polynomial, equation or function, second-degree: involving the second power (square) of a variable but no higher powers, as ax²+bx+c.

quadratical
quadratic

quadratics
plural of quadratic

quadrative
squared
quadratic

quadratocranial
Relating to the quadrate bone and the cranium

quadratojugal
Of or pertaining to the quadrate and jugal bones.
Of or pertaining to the quadratojugal bone.

quadratojugals
plural of quadratojugal

quadratomandibular
Relating to the quadrate bone and the mandible.

quadratosquamosal
Both quadrate and squamosal

quadravalent
Alternative form of quadrivalent.

quadravigesimal
A number system with base twenty-four, using the digits 0–9 and A–N (or Greek α-ω without numerals).
A number expressed in the quadravigesimal system.

quadrennial
Happening every four years.
Lasting for four years.

quadrennials
plural of quadrennial

quadrialate
Having four winglike extensions or parts.

quadriannulate
Having four rings.

quadriarticulate
Having four joints.

quadriarticulated
Alternative form of quadriarticulate.

quadriaxial
Having or relating to four axes.

quadriband
Supporting four frequency bands

quadribasic
tetrabasic

quadrible
Alternative form of quadrable.

quadric
A surface or curve whose shape is defined in terms of a quadratic equation

quadricapsular
Having four capsules

quadricarinate
Having four carinae.

quadricellular
Having four cells.

quadricentennial
Relating to a 400th anniversary.

quadricentennials
plural of quadricentennial

quadricentesimal
Based upon the number four hundred

quadricephalous
Having four heads.

quadrichotomized
simple past and past participle of quadrichotomize

quadriciliate
Having four cilia.

quadriciliated
Alternative form of quadriciliate.

quadricipital
Of or pertaining to the quadriceps.

quadricolor
Having four colors.

quadricolored
Having four colors.

quadricolour
Alternative spelling of quadricolor.

quadricoloured
Alternative spelling of quadricolored.

quadriconsonantal
which consist of four consonants.

quadriconsonantals
plural of quadriconsonantal

quadricornous
having four horns

quadricostate
Having four ribs.

quadricovariant
a covariant of degree 4

quadricovariants
plural of quadricovariant

quadricrescentoid
Having four crescentic folds.

quadrics
plural of quadric

quadriculated
covered with a checkerboard pattern

quadricuspid
Having four cusps.

quadricuspidate
Having four cusps.

quadridentate
Having four teeth.

quadridentated
Alternative form of quadridentate.

quadridentoid
Having four "teeth"

quadridigitate
Having only four fingers on a hand, or toes on a foot

quadridimensional
four-dimensional

quadridirectional
In or relating to four directions.

quadriennial
Alternative form of quadrennial.

quadriennials
plural of quadriennial

quadrifarious
Arranged in four rows or ranks.

quadrifid
Divided, or deeply cleft, into four parts.

quadrifilar
Having four wires, threads or filaments.

quadrifine
Of insect wings, four veined.

quadriflagellate
Having four flagella

quadriflagellates
plural of quadriflagellate

quadrifocal
Of or pertaining to lenses that have four different powers per eye.

quadrifoil
Alternative form of quadrifoliate.

quadrifoliate
Having four leaves.

quadrifoliolate
Having four leaflets.

quadriform
Having four forms, parts or aspects

quadrifrontal
In the form of a quadrifrons.

quadrifurcate
Branching fourfold; having four branches.

quadrifurcated
Having four forks or branches; quadrifurcate.

quadrigal
Of or pertaining to a quadriga (four horse team)

quadrigeminal
Having four parts, or two pairs.

quadrigeminate
Synonym of quadrigeminal.

quadrigenarious
Having or consisting of four hundred.

quadrigeneric
Of or relating to four genera.

quadrigenic
produced by (the interaction of) four genes

quadriglandular
Having or relating to four glands.

quadrijugal
Especially of a chariot: pulled by four horses.

quadrijugate
Pinnate, with four pairs of leaflets.

quadrijugous
quadrijugate

quadrilabial
Articulated with two pairs of lips (i.e. involving mouth-to-mouth contact between two people).

quadrilaminar
Having four layers.

quadrilaminate
Having four layers.

quadrilater
quadrilateral

quadrilateral
A polygon with four sides.
An area defended by four fortresses supporting each other.

quadrilaterals
plural of quadrilateral

quadrilaters
plural of quadrilater

quadrileaflet
Having four leaflets.

quadrilinear
Having, or bounded by, four lines.

quadrilingual
Involving four languages.
Of a text, written in four languages.
Of a person, able to speak four languages.

quadriliteral
Used to describe word roots in Afroasiatic languages which consist of four letters

quadriliterals
plural of quadriliteral

quadrille
A dance originating in the mid-1700s with four couples forming a square, rather much like the modern square dance.
The music for this dance.
A Spanish trick-taking card game from the 1700s played with a 40-card deck.
A choreographed dressage ride, commonly performed to music, with a minimum of four horses.

quadrillionfold
By a multiple of one quadrillion; by a quadrillion times as much or as many.

quadrillionth
The ordinal form of the number one quadrillion.

quadrillionths
plural of quadrillionth

quadrilobate
Having four lobes.

quadrilobed
Having four lobes.

quadrilobular
Having four lobules.

quadrilocular
Having four cells or compartments.

quadriloculate
Having four loculi

quadriloculine
quadrilocular

quadrimalleolar
Involving the lateral malleolus, the medial malleolus, the distal posterior and the anterior tibial tubercule aspect of the tibia.

quadrimanous
Alternative form of quadrumanous.

quadrimembral
Having, or consisting of, four members.

quadrimetallic
Containing atoms of four metals in each molecule.

quadrimillennial
Occurring every four thousand years.

quadrimodal
Having, or employing, four modes

quadrimodular
Having four modes of operation.

quadrimolecular
Involving four molecules

quadrimoraic
Having four morae.

quadrinate
Having four divisions or leaflets.

quadrinational
Of or pertaining to four nations.

quadringenary
A quatercentenary

quadringentenaries
plural of quadringentenary

quadringentenary
Of or relating to a 400th anniversary.

quadringentennial
Of or pertaining to a quadringenary

quadrinodal
Having four nodes.

quadrinomial
Consisting of four names or parts or terms.

quadrinomials
plural of quadrinomial

quadrinominal
Alternative form of quadrinomial.

quadrinuclear
Having four nuclei.

quadrinucleate
Having four nuclei.

quadrinucleated
Alternative form of quadrinucleate.

quadrinucleates
plural of quadrinucleate

quadrinvariant
an invariant of degree 4

quadriparental
Involving four parents.

quadriparetic
Of, relating to, or affected by quadriparesis; having profound weakness in all four extremities.

quadriparous
Having given birth to four offspring.
Laying four eggs.

quadripartite
Divided into four parts.
Involving four parties or participants.

quadripartites
plural of quadripartite

quadripaschal
Including four Passovers.

quadripedal
four-footed

quadripennate
Having four wings.

quadripetal
Having four petals

quadriphasic
Having four phases

quadriphonic
Alternative form of quadraphonic.

quadriphony
Alternative form of quadraphony.

quadriphyllous
Having four leaves

quadripinnate
Having four pinnae

quadriplanar
Composed of, or relating to, four planes.

quadriplegic
Of, related to, or suffering from quadriplegia.

quadriplex
Alternative form of quadruplex.

quadriplicated
Alternative form of quadruplicated.

quadriploid
Alternative form of tetraploid.