jackscrew
UK[ˈdʒækskruː]US[ˈdʒækskruː]
n
a mechanical device for lifting or moving heavy objects, consisting of a threaded rod (screw) turned by a lever or handle.
Morpheme Breakdown
jack
screw
jack
lifting device
screw
threaded fastener
Etymology
the word 'jackscrew' is a transparent compound formed within the english language, combining two common mechanical terms. 'jack', a versatile name applied to many tools and mechanisms, conveys the primary function of lifting. 'screw' describes the specific mechanical principle—a threaded shaft—that converts rotational force into linear motion to achieve that lift. the term logically and literally names the device by its core action ('jack') and its operative mechanism ('screw'), creating a highly descriptive technical term.
Analysis
Structure: jack (lifting device) + screw (threaded fastener)
- jack (english): from the given name 'jack', used generically for various mechanical devices or men. in this compound, it signifies a lifting or mechanical aid.
- screw (old french/middle english): from middle english 'scrue', from old french 'escroue', meaning a screw or nut. it denotes the threaded, cylindrical component central to the device's operation.
Examples
the mechanic used a jackscrew to carefully raise the engine block from the chassis.
for precise alignment during the installation, they adjusted the height with a jackscrew.
a jackscrew is an essential tool in many workshops for handling heavy machinery.