Online Etymology Dictionary

foursome (n.): "four in company," early 14c., from four + -some (1). Specific golf sense is from 1858.
flatus (n.): 1660s, "wind in the bowels," from Latin flatus "a blowing," from flare "to blow" (see blow (v.1)).
focal (adj.): "of or pertaining to a focus," 1690s, from Modern Latin focalis; see focus (n.) + -al (1).
inexactitude (n.): 1786, from in- (1) "not, opposite of" + exactitude. Perhaps modeled on French inexactitude (18c.).
jive (v.2): "agree," 1943, apparently a mistake for jibe (v.), influenced by jive (v.1).
Johannine (adj.): "of or pertaining to the Apostle John," 1839, perhaps via French, from Latin Joannes (see John) + -ine (1). Johannean is from 1842.
invalid (adj.2): "of no legal force," 1630s, from special use of Latin invalidus "not strong, weak, feeble" (see invalid (adj.1)).
irremovable (adj.): "not capable of or subject to removal," 1590s, from assimilated form of in- (1) "not, opposite of" + removable. Related: Irremovably; irremovability.
irresolution (n.): 1590s, from assimilated form of in- (1) "not, opposite of" + resolution. Perhaps from or based on French irrésolution (16c.).
isothermal (adj.): 1816, literally "of equal heat," from French isotherme (see isotherm) + -al (1). As a noun, "isothermal line," from 1849.
birdbath (n.): also bird-bath, bird bath, 1862, from bird (n.1) + bath (n.).
barnyard (n.): 1510s, from barn + yard (n.1). Figurative of coarse or uncivilized behavior from 1920.
ineducable (adj.): "not capable of being instructed," 1858, from in- (1) "not" + educable. Related: Ineducably; ineducability (1871).
improvisational (adj.): 1879; see improvisation + -al (1). Earlier adjectives were improvisatorial (1819), improvisatory (1806).
circumstantial (adj.): c. 1600, from Latin circumstantia (see circumstance) + -al (1). Related: Circumstantially. Circumstantial evidence is attested by 1691.
caprine (adj.): "goat-like," c. 1600, from Latin caprinus, from caper "goat" (see cab) + adjectival suffix -inus (see -ine (1)).
deportment (n.): c. 1600, from Middle French déportement, from déporter "to behave," from Old French deporter (see deport (v.1)).
dermal (adj.): 1803; see derm + -al (1). A native formation, the Greek adjective would be dermatikos, yielding *dermatic.
cranial (adj.): 1779, from Modern Latin cranium, from Greek kranion "skull" (see cranium) + -al (1).
cylindrical (adj.): 1640s, probably from cylindric (but this is attested only from 1680s), from Greek kylindrikos, from kylindros (see cylinder) + -al (1).
bowyer (n.): "maker of bows," attested late 12c. as a surname, from bow (n.1) + -yer.
enmesh (v.): c. 1600, from en- (1) "put in" + mesh (v.). Related: Enmeshed; enmeshing.
enshroud (v.): 1580s, from en- (1) "make, put in" + shroud (n.). Related: Enshrouded; enshrouding.
entreaty (n.): mid-15c., "treatment; negotiation;" see entreat + -y (1). Meaning "urgent solicitation, earnest request" is from 1570s. Related: Entreaties.
brake (v.): "to apply a brake to a wheel," 1868, from brake (n.1). Earlier, "to beat flax" (late 14c.). Related: Braked; braking.
miner (n.): late 13c., from Old French minour (13c.), from miner "to mine" (see mine (n.1)).
electorate (n.): 1670s, "condition of being an elector," in reference to Germany, from elector + -ate (1). Meaning "whole body of voters" is from 1879.
mystical (adj.): late 15c., "enigmatic, obscure, symbolic," from mystic + -al (1). Related: Mystically. Meaning "having spiritual significance" is from 1520s.
mesial (adj.): "middle, median," 1803, an irregular formation from Greek mesos "middle" (see meso-) + -al (1). Related: Mesially.
educational (adj.): 1650s, "due to education;" 1831, "pertaining to education;" from education + -al (1). Related: Educationally.
molding (n.): also moulding, early 14c., "act of kneading," from mold (n.1). Architectural sense is from mid-15c.; carpentry sense is from 1670s.
temperamental (adj.): "of or pertaining to temperament," 1640s, from temperament + -al (1); in the sense of "moody" it is recorded from 1907. Related: Temperamentally.
dietetic (adj.): 1570s, from Latin diaeteticus, from Greek diaitetikos "of or pertaining to diet," from diaita (see diet (1)). As a noun from 1759.
chiefly (adv.): "pre-eminently," mid-14c., from chief + -ly (2). Adjectival meaning "pertaining to a chief" is from 1870 (from -ly (1)).
chink (n.2): "a Chinaman," 1901, derogatory, perhaps derived somehow from China, or else from chink (n.1) with reference to eye shape.
clockwise (adv.): also clock-wise, "in the direction of the hands of a clock," 1879, from clock (n.1) + wise (n.).
coastal (adj.): 1883, from coast (n.) + -al (1). The proper Latin form costal is used only of ribs.
cocky (adj.): "arrogantly pert," 1768; originally "lecherous" (1540s); from cock (n.1) + -y (2). Related: Cockiness.
banker (n.): "keeper of a bank," 1530s, agent noun formed from bank (n.1), possibly modeled on French banquier (16c.).
bankroll (n.): "roll of bank notes," 1887, from bank (n.1) + roll (n.). The verb is attested from 1928. Related: Bankrolled; bankrolling.
barre: 1876, in reference to chords played on a guitar, etc., from French, literally "bar" (see bar (n.1)).
backyard (n.): also back-yard, 1650s (perhaps early 15c.), from back (adj.) + yard (n.1).
bidirectional (adj.): also bi-directional, 1941, from bi- + direction + -al (1). Originally of microphones. Related: Bidirectionally.
vestigial (adj.): 1850, "like a mere trace of what has been," originally in biology, from vestige + -al (1).
occupational (adj.): 1850, from occupation + -al (1). Occupational therapy is attested by 1918; occupational risk by 1951. Related: Occupationally.
light-hearted (adj.): also lighthearted, "cheerful," c. 1400, from light (adj.1) + hearted. Related: Light-heartedly; light-heartedness.
bird-brain (n.): also birdbrain, 1936, slang, "stupid person," also perhaps suggestive of flightiness, from bird (n.1) + brain (n.).
oddball (n.): "eccentric or unconventional person," 1948, from odd + ball (n.1). Earlier (1946) as an adjective, used by aviators.
operational (adj.): 1922, "pertaining to operation," from operation + -al (1). Meaning "in a state of functionality" is from 1944.
logger (n.1): "one who fells or cuts trees," by 1708, agent noun from log (v.1).