(American spelling) A person who takes part in a trial (of a drug etc.)

(archaic) second-person singular simple present form of reason

Of or pertaining to the use of lasers on very small scales.

(pharmacology) An H₂ antagonist C₈H₁₅N₇O₂S₃ (trademark Pepcid) used to inhibit gastric acid secretion especially in the short-term treatment of gastric and duodenal ulcers and gastroesophageal refl...