What does appulse mean?
The definition of appulse
Ap”pulse, n.
Etym: [L. appulsus, fr. appellere, appulsum, to drive to; ad + pellere to drive: cf. F. appulse.]

1 A driving or running towards; approach; impulse; also, the act of striking against. In all consonants there is an appulse of the organs. Holder.
2 (Astron.)
The near approach of one heavenly body to another, or to the meridian; a coming into conjunction; as, the appulse of the moon to a star, or of a star to the meridian.