A hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted.
Roget 223:
covering,
cover;
baldachin,
baldachino†,
baldaquin†;
canopy,
tilt,
awning,
tent,
marquee,
tente d'abri [Fr.],
umbrella,
parasol,
sunshade;
veil
(shade)
424;
shield
etc.
(defense)
717.
roof,
ceiling,
thatch,
tile;
pantile,
pentile†;
tiling,
slates,
slating,
leads;
barrack [U.S.],
plafond,
planchment [U.S.],
tiling,
shed
etc.
(abode)
189.
top,
lid,
covercle†,
door,
operculum;
bulkhead [U.S.].
bandage,
plaster,
lint,
wrapping,
dossil†,
finger stall.
coverlet,
counterpane,
sheet,
quilt,
tarpaulin,
blanket,
rug,
drugget†;
housing;
antimacassar,
eiderdown,
numdah†,
pillowcase,
pillowslip†;
linoleum;
saddle cloth,
blanket cloth;
tidy;
tilpah [U.S.],
apishamore [U.S.].
integument,
tegument;
skin,
pellicle,
fleece,
fell,
fur,
leather,
shagreen†,
hide;
pelt,
peltry†;
cordwain†;
derm†;
robe,
buffalo robe [U.S.];
cuticle,
scarfskin,
epidermis.
clothing
etc.
225;
mask
etc.
(concealment)
530.
peel,
crust,
bark,
rind,
cortex,
husk,
shell,
coat;
eggshell,
glume†.
capsule;
sheath,
sheathing;
pod,
cod;
casing,
case,
theca†;
elytron†;
elytrum†;
involucrum [Lat.];
wrapping,
wrapper;
envelope,
vesicle;
corn husk,
corn shuck [U.S.];
dermatology,
conchology;
testaceology†.
inunction†;
incrustation,
superimposition,
superposition,
obduction†;
scale
etc.
(layer)
204.
[specific coverings]
veneer,
facing;
overlay;
plate,
silver plate,
gold plate,
copper plate;
engobe†;
ormolu;
Sheffield plate;
pavement;
coating,
paint;
varnish
etc.
(resin)
216.1;
plating,
barrel plating,
anointing
etc.
v.;
enamel;
epitaxial deposition [Eng.],
vapor deposition;
ground,
whitewash,
plaster,
spackel,
stucco,
compo;
cerement;
ointment
etc.
(grease)
356.
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