gully, tunnel, main; mine, pit, adit[obs3], shaft; gallery.
     alley, aisle, glade, vista.
     bore, caliber; pore; blind orifice; fulgurite[obs3],
thundertube[obs3].
     porousness, porosity.
     sieve, cullender[obs3], colander; cribble[obs3], riddle, screen;
honeycomb.
     apertion[obs3], perforation; piercing &c. v.; terebration[obs3],
empalement[obs3], pertusion|, puncture, acupuncture, penetration.
     key &c. 631, opener, master key, password, combination, passe-partout. 
     V. open, ope[obs3], gape, yawn, bilge; fly open.
     perforate, pierce, empierce|, tap, bore, drill; mine &c. (scoop out)
252; tunnel; transpierce[obs3], transfix; enfilade, impale, spike, spear, gore, spit, stab, pink, puncture, lance, stick, prick, riddle, punch; stave in.
     cut a passage through; make way for, make room for.
     uncover, unclose, unrip[obs3]; lay open, cut open, rip open, throw
open, pop open, blow open, pry open, tear open, pull open. 
     Adj. open; perforated &c. v.; perforate; wide open, ajar, unclosed,
unstopped; oscitant[obs3], gaping, yawning; patent.
     tubular, cannular[obs3], fistulous; pervious, permeable;
foraminous[obs3]; vesicular, vasicular[obs3]; porous, follicular, cribriform[obs3], honeycombed, infundibular[obs3], riddled; tubulous[obs3], tubulated[obs3]; piped, tubate[obs3].
     opening &c. v.; aperient[obs3]. 
     Int. open sesame!

     #261.  Closure. —­ N. closure, occlusion, blockade; shutting up &c. v.;
obstruction &c. (hindrance) 706; embolus; contraction &c. 195; infarction; constipation, obstipation[obs3]; blind alley, blind corner; keddah[obs3]; cul-de-sac, caecum; imperforation[obs3], imperviousness &c. adj.; impermeability; stopper &c. 263. 
     V. close, occlude, plug; block up, stop up, fill up, bung up, cork up,
button up, stuff up, shut up, dam up; blockade, obstruct &c.
     (hinder) 706; bar, bolt, stop, seal, plumb; choke, throttle; ram down,
dam, cram; trap, clinch; put to the door, shut the door. 
     Adj. closed &c. v.; shut, operculated[obs3]; unopened.
     unpierced[obs3], imporous[obs3], caecal[Med]; closable; imperforate,
impervious, impermeable; impenetrable; impassable, unpassable|2; invious|; pathless, wayless[obs3]; untrodden, untrod.
     unventilated; air tight, water tight; hermetically sealed; tight,
snug.

—­ p. 78 —­

#262.  Perforator. —­ N. perforator, piercer, borer, auger, chisel, gimlet, stylet[obs3], drill, wimble[obs3], awl, bradawl, scoop, terrier, corkscrew, dibble, trocar[Med], trepan, probe, bodkin, needle, stiletto, rimer, warder, lancet; punch, puncheon; spikebit[obs3], gouge; spear &c. (weapon) 727; puncher; punching machine, punching press; punch pliers.

     #263.  Stopper. —­ N. stopper, stopple; plug, cork, bung, spike, spill,
stopcock, tap; rammer[obs3]; ram, ramrod; piston; stop-gap; wadding, stuffing, padding, stopping, dossil[obs3], pledget[obs3], tompion[obs3], tourniquet.
     cover &c. 223; valve, vent peg, spigot, slide valve.
     janitor, doorkeeper, porter, warder, beadle, cerberus, ostiary[obs3].