axis

Noun
  1. is a type of: line - a spatial location defined by a real or imaginary unidimensional extent
    subtypes:
    • coordinate axis - one of the fixed reference lines of a coordinate system
    • major axis - the longest axis of an ellipse or ellipsoid; passes through the two foci
    • semimajor axis - one-half the major axis of an ellipse; the distance from the center of an ellipse to one end
    • minor axis - the shorter or shortest axis of an ellipse or ellipsoid
    • semiminor axis - one-half the minor axis of an ellipse
    • optic axis, principal axis - a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted
    • optic axis - in a doubly refracting crystal, the line in the direction of which no double refraction occurs
  2. is a type of: stalk, stem - a slender or elongated structure that supports a plant or fungus or a plant part or plant organ
    subtypes:
    • rachis - axis of a compound leaf or compound inflorescence
    • spadix - the fleshy axis of a spike often surrounded by a spathe
    has: stele - the usually cylindrical central vascular portion of the axis of a vascular plant
  3. is a type of: alignment, alinement, alliance, coalition - an organization of people (or countries) involved in a pact or treaty
  4. is a type of: alignment, alinement, alliance, coalition - an organization of people (or countries) involved in a pact or treaty
    subtypes: scheduled territories, sterling area, sterling bloc - the group of countries whose currencies are tied to the British pound sterling
    same as: bloc
  5. is a type of: cervical vertebra, neck bone - one of 7 vertebrae in the human spine located in the neck region
    has: odontoid process - a toothlike process at the back of 2nd vertebra of the neck
    same as: axis vertebra
  6. is a type of: mechanism - device consisting of a piece of machinery; has moving parts that perform some function
    subtypes:
    • pin, pivot - axis consisting of a short shaft that supports something that turns
    • rotor head, rotor shaft - the axis around which the major rotor of a helicopter turns
    same as: axis of rotation

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