A pagan holiday and Wiccan Sabbat

Lead monoxide (PbO) a toxic solid formed from the oxidisation of lead in air, and used as a pigment.

(obsolete, chemistry) any salt of lithic acid (uric acid); a urate

plural of lithate

(informal, inorganic chemistry) lithium aluminium hydride.

(chemistry, archaic) crystallized litharge, obtained by fusion in the form of fine yellow scales.

plural of lithagogue

(medicine, archaic) Any medicine capable of expelling calculous matter with the urine.

plural of lithaemia

(medicine) The presence of lithic acid in the blood.