Online Etymology Dictionary

crabgrass (n.): c. 1600, from crab (n.1) + grass. Originally a marine grass of salt marshes; modern meaning is from 1743. Perhaps partly for its crooked form.
panne (n.): 1794, from French panne "soft material, plush" (15c.), earlier penne (13c.), of unknown origin; perhaps from Latin penna "feather" (see pen (n.1)).
parenthetical (adj.): 1620s, from Medieval Latin parentheticus from Greek parenthetos "put in beside," verbal adjective from parentithenai; see parenthesis) + -al (1). Related: Parenthetically.
periodical (adj.): c. 1600, from periodic + -al (1). As a noun meaning "magazine published at regular intervals," attested from 1798. Related: Periodically.
peduncle (n.): 1753, from Modern Latin pedunculus "footstalk," diminutive of pes (genitive pedis) "foot," from PIE root *ped- (1) "a foot" (see foot (n.)).
recessional (adj.): 1858, from recession + -al (1). As a noun, "hymn sung while the clergy and choir are leaving church," 1864, with -al (2).
quarterly (adv.): early 15c., from quarter (n.) + -ly (2). As an adjective from 1560s, from -ly (1). As a noun, from 1830, "a quarterly publication," from the adjective.
raincheck (n.): also rain-check, rain check, 1884; see rain (n.) + check (n.1). Originally of tickets to rained-out baseball games.
cupreous (adj.): 1660s, from Late Latin cupreus "of copper," from cuprum, alternative form of cyprum "copper" (see copper (n.1)). Related: Cupric (1799).
eye-service (n.): "work done only under inspection or while the master is watching," 1530s, from eye (n.) + service (n.1). Related: Eye-servant.
statesman (n.): 1590s, after French homme d'état; see state (n.1) + man (n.). Related: Statesmanly; statesmanship. Stateswoman attested from c. 1600.
switchboard (n.): also switch-board, "device for making interchangeable connections between many circuits," 1867, from switch (n.) + board (n.1).
traditional (adj.): 1590s, "observing traditions;" c. 1600, "handed down as tradition," from tradition + -al (1). In reference to jazz, from 1950. Related: Traditionally; traditionalist.
soulmate (n.): 1822 (as soul mate), first attested in Coleridge, from soul (n.1) + mate (n.). One-word form is from early 20c.
roebuck (n.): c. 1200, from roe (n.2) + buck (n.1). Similar formation in Dutch reebok, German Rehbock, Danish raabuck.
boot-licker (n.): also bootlicker, "toady, servile follower," 1846, from boot (n.1) + agent noun from lick (v.). Foot-licker in the same sense is from 1610s.
mass (v.): "to gather in a mass" (intransitive), 1560s, from mass (n.1) or from French masser. Transitive sense by c. 1600. Related: Massed; massing.
bob (n.1): "act of bobbing," 1540s, from bob (v.1). As a slang word for "shilling" it is attested from 1789, but the signification is unknown.
shower (v.): 1570s, "come down in showers;" 1580s, "to discharge a shower," from shower (n.1). Intransitive sense from 1930. Related: Showered; showering.
lead (v.2): early 15c., "to make of lead," from lead (n.1). Meaning "to cover with lead" is from mid-15c. In printing, 1841, also lead out.
undone (adj.): "not accomplished," c. 1300, from un- (1) "not" + done. The same word meaning "destroyed" is recorded from mid-14c., past participle adjective from undo.
calf (n.2): fleshy part of the lower leg, early 14c., from Old Norse kalfi, source unknown; possibly from the same Germanic root as calf (n.1).
pulse (v.): "to beat, throb," early 15c., from pulse (n.1) or else from Latin pulsare "to beat, throb," and in part from French. Related: Pulsed; pulsing.
mugging (n.): "violent physical attack," 1846, verbal noun from mug (v.1). As "grimmacing, making faces," 1937, from mug (v.2).
peep (n.1): 1520s, first in sense found in peep of day, from peep (v.1); meaning "a furtive glance" is first recorded 1730.
paronym (n.): "cognate word," 1846, from Greek paronymos, "formed by a slight change," from para- (see para- (1)) + onyma (see name (n.)). Related: Paronymous (1660s).
-osity: word-forming element making nouns from adjectives in -ous, -ose (1); from French -osité, from Latin -ositatem (nominative -ositas), properly -ose + -ity.
ornithopod (n.): 1888, from Modern Latin Ornithopoda (1881), from ornitho- + Greek podos, genitive of pous "foot," from PIE root *ped- (1) "a foot" (see foot (n.)).
post (v.1): "to affix (a paper, etc.) to a post" (in a public place), hence, "to make known," 1630s, from post (n.1). Related: Posted; posting.
check (v.2): "mark like a chessboard, incise with a pattern of squares or checks," late 14c. (implied in checked), from check (n.1). Related: Checking.
checker (v.): "to ornament with a checked or chackered design," late 14c. (implied in checkered), from Old French eschequeré and from checker (n.1). Related: Checkering.
cheapen (v.): 1570s, "ask the price of," from cheap (adj.) + -en (1). Meaning "lower the price of" is from 1833, but figuratively, "to lower in estimation" is from 1650s. Related: Cheapened; cheapening.
bail (v.2): "to procure someone's release from prison" (by posting bail), 1580s, from bail (n.1); usually with out. Related: Bailed; bailing.
docksider (n.): 1969 as "person who frequents docks," 1974 as the name of a type of shoe, "a cheaper version of the topsider;" from dock (n.1) + side (n.).
cheesed (adj.): "disgruntled, exasperated," 1941, British slang, origin obscure, connections uncertain. See cheese (n.1), cheese (n.2), cheesy.
pole-vault (n.): 1877, from pole (n.1) + vault (n.2). As a verb from 1892 (implied in pole-vaulting). Related: Pole-vaulted.
clipping (n.2): "a cutting," early 14c., verbal noun from clip (v.1). Sense of "a small piece cut off" is from late 15c. Meaning "an article cut from a newspaper" is from 1857.
clock (n.2): "ornament pattern on a stocking," 1520s, probably identical with clock (n.1) in its older sense and meaning "bell-shaped ornament."
quadruplicate (adj.): 1650s, from Latin quadruplicatus, past participle of quadruplicare "make fourfold," from quadri- "four" (see quadri-) + plicare "to fold" (see ply (v.1)).
repair (n.): 1590s, "act of restoring, restoration after decay," from repair (v.1). Meaning "state or condition in respect to reparation" is from c. 1600.
spat (n.3): "spawn of a shellfish," especially "spawn of an oyster," also "a young oyster," 1660s, of unknown origin, perhaps from the past tense of spit (v.1).
scudo (n.): old Italian silver coin, Italian, literally "shield" (in reference to the device it bore), from Latin scutum (see hide (n.1)).
rip-tide (n.): also riptide, 1862, from rip (n.1) + tide (n.). It is a current not a tide, and the attempt to correct it to rip current dates from 1936.
rack (n.4): "cut of animal meat and bones," 1560s, of unknown origin; perhaps from some resemblance to rack (n.1). Compare rack-bone "vertebrae" (1610s).
rapping (n.): c. 1400, verbal noun from rap (v.1). Meaning "talking" is from 1969; meaning "rap music performance" is from 1979, from rap (v.2).
-scopy: word-forming element meaning "viewing, examining, observing," from Modern Latin -scopium, from Greek -skopion, from skopein "to look at, examine" (see scope (n.1)).
saddelry (n.): mid-15c., "occupation or trade of a saddler," from saddler + -y (1). From 1841 as "place where saddles are made or sold."
scout (n.): "person who scouts, one sent out to gain information," 1550s, from scout (v.1). Boy Scout is from 1908. Scout's honor attested from 1908.
scale (v.2): "remove the scales of (a fish, etc.)," c. 1400, from scale (n.1). Intransitive sense "to come off in scales" is from 1520s. Related: Scaled; scaling.
snarl (n.1): late 14c., "a snare, noose," from snarl (v.1). Meaning "a tangle, a knot" is first attested c. 1600. Meaning "a traffic jam" is from 1933.