noun

• (heraldry) A serpent.
  "LORD SCARSDALE. [...] On the dexter ſide, the figure of Prudence repreſented by a woman, habited argent, mantled azure, holding in her ſiniſter hand a javelin entwined with a remora proper; [...]"
• (obsolete) A delay; a hindrance, an obstacle.
  "For to ſay [...] That the ſolidneſſe of the Earth is for the ſtation and Manſion of liuing creatures: and the like, is well inquired & collected in METAPHISICKE, but in PHISICKE they are impertinent. Nay, they are indeed but Remoraes and hinderances to ſtay and ſlugge the Shippe from furder ſayling, and haue brought this to paſſe, that the ſearch of the Phiſicall Cauſes hath beene neglected."
• (obsolete, surgery) A surgical instrument, intended to retain parts in their places.
  "Rem′ora [...] The name of two surgical instruments, intended to retain parts in situ. The one was used, formerly, in castration, to prevent the intestines from protruding at the inguinal ring: the other, called Rem′ora Hilda′ni, (F[rench]) Arrêt d'Hildan, εχενηις, was employed to retain fractures and luxations reduced. It is not now used."