Careful Words
sinus
(n.)
alveolus
antrum
arc
armpit
basin
bow
bowl
catenary
caustic
cavity
circle
concavity
crater
crook
crypt
cup
curl
curve
depression
dip
ellipse
festoon
fold
follicle
hole
hollow
hook
hyperbola
lacuna
parabola
pit
pocket
scoop
shell
sink
socket
tracery
trough
by
simon sarris
•
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