(chiefly US, colloquial, idiomatic, somewhat vulgar) To be manly, brave.

plural of base pair

(biology) In molecular biology, two nucleotides on opposite complementary DNA or RNA strands that are connected via hydrogen bonds.

(poker) A hand which contains two pairs.

plural of pair of compasses

(US, politics) Two members of Congress who would have otherwise cast opposing votes, but who form an agreement whereby one announces the couple is a live pair and registers his or her own vote as present rather than for or against. Although not recognized or recorded in vote tallies, the effect is to allow the other member to be absent without affecting the outcome of the vote.

A single garment that covers one's legs individually with sleeves, and also covers the pelvis. / (topology) The orientable surface of genus zero having three boundary components.

plural of ordered pair

(colloquial) A pair of lenses set in a frame worn on the nose and ears in order to correct deficiencies in eyesight or to ornament the face.

A pair of lenses set in a frame worn on the nose and ears in order to correct deficiencies in eyesight or to ornament the face.