A small tube.
Roget 260:
hole,
foramen;
puncture,
perforation;
fontanel†;
transforation†;
pinhole,
keyhole,
loophole,
porthole,
peephole,
mousehole,
pigeonhole;
eye of a needle;
eyelet;
slot.
opening;
aperture,
apertness†;
hiation†,
yawning,
oscitancy†,
dehiscence,
patefaction†,
pandiculation†;
chasm
etc.
(interval)
198.
embrasure,
window,
casement;
abatjour†;
light;
sky light,
fan light;
lattice;
bay window,
bow window;
oriel [Arch.];
dormer,
lantern.
outlet,
inlet;
vent,
vomitory;
embouchure;
orifice,
mouth,
sucker,
muzzle,
throat,
gullet,
weasand†,
wizen,
nozzle;
placket.
portal,
porch,
gate,
ostiary†,
postern,
wicket,
trapdoor,
hatch,
door;
arcade;
cellarway†,
driveway,
gateway,
doorway,
hatchway,
gangway;
lich gate†.
way,
path
etc.
627;
thoroughfare;
channel;
passage,
passageway;
tube,
pipe;
water pipe
etc.
350;
air pipe
etc.
351;
vessel,
tubule,
canal,
gut,
fistula;
adjutage†,
ajutage†;
ostium†;
smokestack;
chimney,
flue,
tap,
funnel,
gully,
tunnel,
main;
mine,
pit,
adit†,
shaft;
gallery.
alley,
aisle,
glade,
vista.
bore,
caliber;
pore;
blind orifice;
fulgurite†,
thundertube†.
porousness,
porosity.
sieve,
cullender†,
colander;
cribble†,
riddle,
screen;
honeycomb.
apertion†,
perforation;
piercing
etc.
v.;
terebration†,
empalement†,
pertusion†,
puncture,
acupuncture,
penetration.
key
etc.
631,
opener,
master key,
password,
combination,
passe-partout.
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Polish: kanalik