extra small

plural extra smalls · alternative extra-small

1. uncountableOne of several sizes to which an item may be manufactured.

   Synonyms: XS

2. countableAn item labelled or denoted as being that size.
3. countableOne who fits an item of that size.

alternative extra-small

1. especiallynot comparablebusinessThat is extra small (the manufactured size).
2. especiallynot comparableUsed other than figuratively or idiomatically: see extra, small.