“left-hand screw”

We have one entry that includes the term left-hand screw.

left-hand screw thread

noun

: a screw thread whose helix moves upward when the screw is inserted vertically from above in a fixed mating thread and turned clockwise

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  • any of a genus helianthus especially h annuus of new world composite plants with large yellow rayed flower heads bearing edible seeds that yield an edible oil
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