(botany) Any of very many primitive plants that consist of a thallus (plant body not differentiated into roots, stems and leaves), formerly collected in the obsolete taxonomic group Thallophyta.

plural of ravel bread

(pharmacology) A synthetic immunomodulator derived from muramyl dipeptide, the smallest bioactive unit of bacterial peptidoglycan.

(biochemistry) The state of being fully phosphorylated, so that all potential phosphorylation sites are occupied