Initialism of left-to-right, used to describe scripts written starting from the left-hand side.

(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.

(chemistry) a cyclic sulfonamide in which the S-N bond is part of the ring

plural of antitoxine