locomotor
Word family
- locomotionnounB2
- locomotivenounB1
- locomotiveadjectiveC1
- motornounA2
- mobilitynounB2
Synonym discussion
Sense: adjective/1
Locomotor is the most specific of these movement-related adjectives. It is used almost exclusively in biology and medicine to describe the whole-body ability of a living creature to travel from one place to another — locomotor activity in lab rats, locomotor disability in patients, the locomotor system of vertebrates. Locomotive, as an adjective, leans toward the mechanical: the power that drives movement forward (locomotive force, locomotive engine). When you describe a person or animal, stick with locomotor. Motor is narrower still — it refers to the nerves and muscles that produce movement at a physical level (motor cortex, fine motor skills), not the act of moving through the environment. Mobile is the everyday word for being able to move or be moved (a mobile phone, an elderly person staying mobile), and it carries none of the scientific weight of locomotor. Think of it this way: motor powers the muscle, locomotor moves the body, locomotive drives the machine, and mobile describes anything that isn't stuck in place.
Common collocations
Adverbs
- purely locomotor
- primarily locomotor
Phrases
- locomotor activity
- locomotor system
- locomotor disability
- locomotor skills
Etymology
Formed from the noun locomotion (itself from Latin locus 'place' and motio 'movement') plus the adjective suffix -or. The term was coined in 19th-century scientific Latin as 'locomotorius' and has been used in English biological and medical writing ever since.