"size of printing type of about six lines to the inch" (12 point), 1580s, probably from pica, the name of a book of rules in the Church of England for determining holy days (late 15c. in Anglo-Latin). This is probably from Latin pica "magpie" (see pie (n.2)); the book so called perhaps from the color and the "pied" look of the old type on close-printed pages. The type size was that generally used to print ordinals.
(Latin plural genera), 1550s as a term of logic, "kind or class of things" (biological sense dates from c. 1600), from Latin genus (genitive generis) "race, stock, kind; family, birth, descent, origin" (from suffixed form of PIE root *gene- "give birth, beget," with derivatives referring to procreation and familial and tribal groups).
"pathological craving for substance unfit for food" (such as chalk), 1560s, from Medieval Latin pica "magpie" (see pie (n.2)), probably translating Greek kissa, kitta "magpie, jay," also "false appetite." The connecting notion may be the birds' indiscriminate feeding. Compare geophagy.
As the magpie eats young birds, here is the bird to keep the sparrows' numbers in check, for it will live in towns and close to dwellings—just the localities sparrows frequent. The magpie's appetite is omnivorous, and it is charged with at times killing weakly lambs, and varying its diet by partaking of grain and fruit; but I never at Home heard any complaints of this bird from the farmers, whilst the gamekeepers had not a good word for it. The bird will eat carrion, so if one were disturbed taking a meal from a dead lamb it would probably be blamed for its death, which may have occurred from natural causes. [A. Bathgate, "The Sparrow Plague and its Remedy," in Transactions of the New Zealand Institute, 1903]
"magpie," mid-13c. (late 12c. as a surname), from Old French pie (13c.), from Latin pica "magpie" (see magpie).
"cartilaginous fish resembling or related to a shark of the genus selachii," 1835; the genus name from Latinized form of Greek selakhos (plural selakhē) "cartilaginous fish," which is of uncertain origin.