(chemistry) A three-step synthetic route in steroid chemistry, used for the production of cortisone and mammalian sex hormones from plant steroids.

A gene or DNA sequence with a known location on a chromosome that can be used to identify individuals or species.

(grammar) A word or affix attached to the stem of a verb in order to form the full infinitive.

(Singapore) A governmental restriction on free speech, limiting topics that can be written about.

plural of marker gene

plural of marker bed

(medicine) A substance added to food to allow the measurement of how quickly it passes through the segments of the digestive tract.

A numbered milepost or sign along a highway, or some other road, used to determine the location of a motor vehicle.

(soccer) A player who man-marks

(aviation) A type of marker beacon placed to indicate the final approach fix of an ILS or IGS approach, triggering a continuous sequence of visual and aural Morse code dashes from the marker beacon receiver in the cockpit of an aircraft flying over the marker.