Antiparallel vs. Perpendicular

Antiparalleladjective

(mathematics) (of vectors) Parallel but in opposite directions.

Perpendicularadjective

(geometry) At or forming a right angle (to something).

‘In most houses, the walls are perpendicular to the floor.’;

Antiparalleladjective

(biochemistry) Describing the orientations of the two strands of DNA.

Perpendicularadjective

Exactly upright; extending in a straight line toward the centre of the earth, etc.

Antiparalleladjective

(biochemistry) Describing two beta strands comprising a protein's secondary structure that are aligned and hydrogen bonded but where the vectors describing the amino- and carboxy-terminal ends of each strand are oriented 180° relative to one another.

Perpendicularnoun

(geometry) A line or plane that is perpendicular to another.

Antiparallelnoun

(geometry) A line that forms equal angles with two other lines, but in opposite directions.

Perpendicularnoun

A device such as a plumb line that is used in making or marking a perpendicular line.

Antiparalleladjective

Running in a contrary direction.

Perpendicularadjective

Exactly upright or vertical; pointing to the zenith; at right angles to the plane of the horizon; extending in a right line from any point toward the center of the earth.

Antiparalleladjective

(especially of vectors) parallel but oppositely directed;

‘antiparallel vectors’;

Perpendicularadjective

At right angles to a given line or surface; as, the line ad is perpendicular to the line bc.

Perpendicularnoun

A line at right angles to the plane of the horizon; a vertical line or direction.

Perpendicularnoun

A line or plane falling at right angles on another line or surface, or making equal angles with it on each side.

Perpendicularnoun

a straight line at right angles to another line

Perpendicularnoun

a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting

Perpendicularnoun

a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point

Perpendicularnoun

an extremely steep face

Perpendicularadjective

intersecting at or forming right angles;

‘the axes are perpendicular to each other’; ‘parallel lines never converge’; ‘concentric circles are parallel’; ‘dancers in two parallel rows’;

Perpendicularadjective

at right angles to the plane of the horizon or a base line;

‘a vertical camera angle’; ‘the monument consists of two vertical pillars supporting a horizontal slab’; ‘measure the perpendicular height’;

Perpendicularadjective

extremely steep;

‘the great perpendicular face of the cliff’;

Perpendicularadjective

at an angle of 90° to a given line, plane, or surface or to the ground

‘dormers and gables that extend perpendicular to the main roofline’;

Perpendicularadjective

at an angle of 90° to the ground; vertical

‘the perpendicular cliff’;

Perpendicularadjective

so steep as to be almost vertical

‘houses seem to cling by blind faith to the perpendicular hillside’;

Perpendicularadjective

denoting the latest stage of English Gothic church architecture, prevalent from the late 14th to mid 16th centuries and characterized by broad arches, elaborate fan vaulting, and large windows with vertical tracery

‘the Perpendicular style’; ‘the handsome Perpendicular church of St Andrew’;

Perpendicularnoun

a straight line at an angle of 90° to a given line, plane, or surface

‘at each division draw a perpendicular representing the surface line’;

Perpendicularnoun

perpendicular position or direction

‘the wall declines from the perpendicular a little inward’;

Perpendicular

In elementary geometry, the property of being perpendicular (perpendicularity) is the relationship between two lines which meet at a right angle (90 degrees). The property extends to other related geometric objects.