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Q fever
'Q' waves
Q0957+561 A,B
Q-type asteroid
quadrangle
quadrant
quadratic
quadratrix of Hippias
quadrature
quadric
quadriceps femoris
quadrilateral
quantum
quantum chromodynamics
quantum computer
quantum cosmology
quantum dimensions
quantum entanglement
quantum field theory
quantum gravity
quantum mechanics
quantum number
quantum teleportation
quantum theory origins and Max Planck
quantum vacuum
Quaoar
quarantine
quark
quark star
quartic
quartile
quartz
quartzite
quasar
quasicrystal
quasiperiodic
quasi-regular polyhedron
quasistationary orbit
Quaternary
quaternion
queens problem
Quest Joint Airlock (on ISS)
quicksand
QuikScat (Quick Scatterometer) satellite
QuikTOMS (Quick Total Ozone Mapping Spectrometer) satellite
Quimby, Harriet (1875–1912)
Quine, Willard Van Orman (1908–2000)
quinine
quinone
quinsy
quintessence
quintic
Quintuplet Cluster
quipu
quotient