Definition of "jerfalcon"

For I obſerve, that all vvomen of your condition are like the vvomen of the Play-houſe, ſtill Piquing at each other, vvho ſhall go the beſt Dreſt, and in the Richeſt Habits: till you vvork up one another by your high flying, as the Heron and Jerfalcon do.

1668 June 22 (first performance; Gregorian calendar), John Dryden, An Evening’s Love, or The Mock-Astrologer. […], In the Savoy [London]: […] T[homas] N[ewcomb] for Henry Herringman, […], published 1671, Act IV, page 53