(grammar) A tense used in some languages (such as French and Italian) in narrative, and in spoken language primarily when reading narrative or in storytelling, for completed actions in the past or in speaking of the dead. It is semantically the same as the simple past in many languages, including English.

(biology) The study of the microscopic structure, chemical composition and function of the tissue or tissue systems of plants and animals.

The past historic tense.

In a historic manner; with reference to history or the historical record. / According to history: formerly, in the past, traditionally. / To an unprecedented or extremely rare degree.

A writer of history; a chronicler; an annalist. / One who studies or researches history. / (medicine) One who recounts their own medical history.

(biochemistry) A widely occurring flavoprotein enzyme that oxidizes histamine and various diamines.

breakdown of bodily tissues

(biochemistry) An amine, C₅H₉N₃, formed by decarboxylation of histidine, that causes dilatation of capillaries, contraction of smooth muscle, and stimulation of gastric acid secretion; it is released during allergic reactions.

(biochemistry) An essential amino acid C₆H₉N₃O₂ found in most animal proteins; essential for tissue growth and repair.

a genealogist or historian who studies family history