core

nouns

a small group of indispensable persons or things
"five periodicals make up the core of their publishing program"
core, core group, nucleus
the center of an object
"the ball has a titanium core"
core
is a type of (narrower)
a point equidistant from the ends of a line or the extremities of a figure
center, centre, midpoint
the central part of the Earth
core
is a type of (narrower)
a point equidistant from the ends of a line or the extremities of a figure
center, centre, midpoint
the choicest or most essential or most vital part of some idea or experience
"the gist of the prosecutor's argument"; "the heart and soul of the Republican Party"; "the nub of the story"
center, centre, core, essence, gist, heart, heart and soul, inwardness, kernel, marrow, meat, nitty-gritty, nub, pith, substance, sum
a cylindrical sample of soil or rock obtained with a hollow drill
core
is a type of (narrower)
all or part of a natural object that is collected and preserved as an example of its class
sample
the central meaning or theme of a speech or literary work
burden, core, effect, essence, gist
(computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data; now superseded by semiconductor memories
"each core has three wires passing through it, providing the means to select and detect the contents of each bit"
core, magnetic core
the chamber of a nuclear reactor containing the fissile material where the reaction takes place
core
is a part of
(physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements
nuclear reactor, reactor
is a type of (narrower)
a natural or artificial enclosed space
chamber
a bar of magnetic material (as soft iron) that passes through a coil and serves to increase the inductance of the coil
core
is a part of
(physics) a device that attracts iron and produces a magnetic field
magnet
is a type of (narrower)
a rigid piece of metal or wood; usually used as a fastening or obstruction or weapon
"there were bars in the windows to prevent escape"
bar

verbs

remove the core or center from
"core an apple"
core
is a type of (narrower)
remove the interior of
"hollow out a tree trunk"
core out, hollow, hollow out