[COUNTER- 6.] An opening opposite another; spec. in Surgery, an opening made in an abscess opposite to one already existing, to facilitate the discharge of matter.
1611. Cotgr., Contr-’ouverture, a counter-opening.
1766. Justamond, in Phil. Trans., LVI. 271–2. I Immediately made free incisions and counter-openings in the parts which contained the matter.
a. 1778. S. Sharp, Surgery (1782), Introd. p. xxvi. (J.). Mark the Place for a Counter-opening.
1882. in Syd. Soc. Lex.
