in-line skate

US: (in′līn′)

WordReference Random House Learner's Dictionary of American English © 2025

ˈin-ˌline ˈskate, n. [countable]

1. Sport a roller skate with four hard-rubber wheels in a straight line.

in-line skat•ing, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2025

in′-line skate′  (in′līn′), 

1. Sport a roller skate with typically four hard-rubber wheels in a straight line resembling the blade of an ice skate.

• 1985–90

in′-line skat′er. 
in′-line skat′ing. 

Collins Concise English Dictionary © HarperCollins Publishers::

in-line skate noun

1. a type of roller skate in which the wheels are set in a single straight line under the boot

in-line skater noun

in-line skating noun