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Webster 1913 Edition

Adj.

(Med.)

Depressing or diminishing the capacity for movement, as depressomotor nerves, which lower or inhibit muscular activity.

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Noun.

Any agent that depresses the activity of the motor centers, as bromides, etc.

depressomotor ‎(not comparable)

(medicine) Depressing or diminishing the capacity for movement.
Depressomotor nerves lower or inhibit muscular activity.

depressomotor ‎(plural depressomotors)

(medicine) Any agent that depresses the activity of the motor centres.
Bromides are depressomotors.