 Types:
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compartment
a space into which an area is subdivided

crenel, crenelle
a notch or open space between two merlons in a crenelated battlement

pleural space
the small potential space between the parietal and visceral layers of the pleura

subarachnoid space
a space in the meninges beneath the arachnoid membrane and above the pia mater that contains the cerebrospinal fluid

enclosure, natural enclosure
a naturally enclosed space

expanse
a wide and open space or area as of surface or land or sky

gap, opening
an open or empty space in or between things

swath
the space created by the swing of a scythe or the cut of a mowing machine

angle
the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians

emptiness, vacancy, vacuum, void
an empty area or space

hole
an unoccupied space

cavity, enclosed space
space that is surrounded by something

pocket
(bowling) the space between the headpin and the pins behind it on the right or left

cell
any small compartment

cubbyhole, pigeonhole
a small compartment

pocket
an opening at the corner or on the side of a billiard table into which billiard balls are struck

PO Box, POB, PostOffice box, call box, letter box
a numbered compartment in a post office where mail is put to be called for

diastema
a gap or vacant space between two teeth

Ranvier's nodes, nodes of Ranvier
small gaps in the myelin sheath of medullated axons

foramen, hiatus
a natural opening or perforation through a bone or a membranous structure

crotch, fork
the angle formed by the inner sides of the legs where they join the human trunk

breach
an opening (especially a gap in a dike or fortification)

cavern
any large dark enclosed space

chasm
a deep opening in the earth's surface

cleft, crack, crevice, fissure, scissure
a long narrow opening

hole
an opening into or through something

matrix
an enclosure within which something originates or develops (from the Latin for womb)

mouth
an opening that resembles a mouth (as of a cave or a gorge)

rift
a gap between cloud masses

rent, rip, snag, split, tear
an opening made forcibly as by pulling apart

sheet
any broad thin expanse or surface

stretch
a large and unbroken expanse or distance

window
an opening that resembles a window in appearance or function

axil
the upper angle between an axis and an offshoot such as a branch or leafstalk

helix angle
the constant angle at which a helix cuts the elements of a cylinder or cone

complementary angles
two angles whose sum is a right angle

angular distance
the angular separation between two objects as perceived by an observer

plane angle
an angle formed by two straight lines (in the same plane)

spherical angle
an angle formed at the intersection of the arcs of two great circles

solid angle
an angle formed by three or more planes intersecting at a common point (the vertex)

angle of inclination, inclination
(geometry) the angle formed by the xaxis and a given line (measured counterclockwise from the positive half of the xaxis)

inclination, inclination of an orbit
(astronomy) the angle between the plane of the orbit and the plane of the ecliptic stated in degrees

salient angle
an angle pointing outward; an interior angle of a polygon that is less than 180 degrees

interior angle, internal angle
the angle inside two adjacent sides of a polygon

exterior angle, external angle
the supplement of an interior angle of a polygon

angle of incidence, incidence angle
the angle that a line makes with a line perpendicular to the surface at the point of incidence

angle of reflection
the angle between a reflected ray and a line perpendicular to the reflecting surface at the point of incidence

angle of refraction
the angle between a refracted ray and a line perpendicular to the surface between the two media at the point of refraction

angle of extinction, extinction angle
the angle from its axis that a crystal must be rotated before appearing maximally dark when viewed in polarized light

dogleg
angle that resembles the hind leg of a dog

right angle
the 90 degree angle between two perpendicular lines

oblique angle
an angle that is not a right angle or a multiple of a right angle

reflex angle
an angle greater than 180 degrees (but less than 360)

perigon, round angle
an angle of 360 degrees

cutting angle
the angle between the face of a cutting tool and the surface of the work

angle of dip, dip, inclination, magnetic dip, magnetic inclination
(physics) the angle that a magnetic needle makes with the plane of the horizon

lead
the angle between the direction a gun is aimed and the position of a moving target (correcting for the flight time of the missile)

magnetic declination, magnetic variation, variation
the angle (at a particular location) between magnetic north and true north

AZ, azimuth
the azimuth of a celestial body is the angle between the vertical plane containing it and the plane of the meridian

hollow
a cavity or space in something

pore
any tiny hole admitting passage of a liquid (fluid or gas)

pocket, pouch, sac, sack
an enclosed space

polyhedral angle
the space enclosed by three or more planes that intersect in a vertex

face angle
the angle formed by two edges of a polyhedral angle

tilt angle
the angle a rocket makes with the vertical as it curves along its trajectory

vertical angle
either of two equal and opposite angles formed by the intersection of two straight lines

angle of view, view angle
the angle included by a photographic lens

wave angle
the angle of arrival (or departure) of a radio wave with respect to the axis of an antenna array