semipermeable.

Allowing some substances to pass through while restricting others.

Use it for

Words that belong together

• a semipermeable membrane
• a semipermeable barrier

On the page

The semipermeable membrane admitted the solvent while restricting much of the solute.

She checked what the semipermeable barrier excluded before relying on it.

Usage notes

Primary category: sci-fi. Forms: Relational adjective; compare degree of resistance or deficiency explicitly rather than forcing a routine superlative. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.