Hand by the block stood the grim figure of the executioner, his visage being concealed in a tengallon pot with two circular perforated apertures through which his eyes glowered furiously.
By inserting the barrel of an arruginated male key in the hole of an unstable female lock, obtaining a purchase on the bow of the key and turning its wards from right to left, withdrawing a bolt from its staple, pulling inward spasmodically an obsolescent unhinged door and revealing an aperture for free egress and free ingress.
He deposited the articles of clothing on a chair, removed his remaining articles of clothing, took from beneath the bolster at the head of the bed a folded long white nightshirt, inserted his head and arms into the proper apertures of the nightshirt, removed a pillow from the head to the foot of the bed, prepared the bedlinen accordingly and entered the bed.
There are no more uses of "aperture" in the book.
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The higher the f-stop, the more closed the camera’s aperture.
It wandered along the crest of the hill and terminated before a fragment of wall pierced by a rough aperture which had once been a door.