plural of positiveness

plural of positivity

(medicine) Of a blood type within the ABO and Rh blood grouping system. Blood type A positive has a phenotype of "A" and a Rhesus system classification of positive.

plural of positioning

plural of positer

One who posits something.

(motor racing) The bottom qualifying position in a race, on the outside of the last row at the starting line.

(motor racing) The position given at the start of a race, ranked from most favorable to least favorable, awarded according to the times achieved during qualification.

(motor racing) The top qualifying position for a race, on the inside of the front row at the starting line. / (by extension) First place.

(optics) A doubly refracting crystal in which the index of refraction for the extraordinary ray is greater than for the ordinary ray, and the former is refracted nearer to the axis than the latter, such as quartz and ice; as opposed to negative crystal: one in which this characteristic is reversed, such as Iceland spar or tourmaline.