laver

noun7

1. •
   A red alga/seaweed, Porphyra umbilicalis (syn. Porphyra laciniata), eaten as a vegetable.
2. •
   Other seaweeds similar in appearance or use.
3. •
   Porphyra vulgaris
4. •
   That which laves, particularly a washbasin.

   • Infinit streames continually did well / Out of this fountaine, sweet and faire to see, / The which into an ample lauer fell […] — 1590
5. •
   Where one laves, a washroom, particularly a lavatorium, the washing area in a monastery.
6. •
   The spiritual washing or ablution of baptism.
7. •
   One who laves: a washer.