Etymology
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Words related to -in

in (adv., prep.)

a Middle English merger of Old English in (prep.) "in, into, upon, on, at, among; about, during;" and Old English inne (adv.) "within, inside," from Proto-Germanic *in (source also of Old Frisian, Dutch, German, Gothic in, Old Norse i), from PIE root *en "in." The simpler form took on both senses in Middle English.

Sense distinction between in and on is from later Middle English, and nuances in use of in and at still distinguish British and American English (in school/at school). Sometimes in Middle English shortened to i.

The noun sense of "influence, access (to power or authorities)," as in have an in with, is first recorded 1929 in American English. to be in for it "certain to meet with something unpleasant" is from 1690s. To be in with "on friendly terms with" is from 1670s. Ins and outs "intricacies, complications of an action or course" is from 1660s. In-and-out (n.) "copulation" is attested from 1610s.

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sit-in (n.)

"act of sitting in," 1937, from the verbal phrase, "take part, have a place" as a player in a game (1590s); see sit (v.) + in (adv.). The verbal phrase is attested by 1936 in reference to session musicians, "join in" with a band or orchestra. As "occupy a building," it is attested by 1937 in reference to union action, by 1941 in reference to student protests. To sit in is attested from 1868 in the sense of "attend, be present," and from 1919 specifically as "attend as an observer."

-ine (2)

word-forming element in chemistry, often interchangeable with -in (2), though modern use distinguishes them; early 19c., from French -ine, the suffix commonly used to form words for derived substances, hence its extended use in chemistry. It was applied unsystematically at first (as in aniline), but now has more restricted use.

The French suffix is from Latin -ina, fem. form of -inus, suffix used to form adjectives from nouns, and thus is identical with -ine (1).

antivenin (n.)

"antivenom," 1894, from anti- + venin, from venom + chemical suffix -in (2). Perhaps immediately from French antivenin.

auxin (n.)

plant growth hormone, 1934, from German (1931), from Greek auxein "to increase" (from PIE root *aug- (1) "to increase") + chemical suffix -in (2).

biotin (n.)

vitamin of the B group (also sometimes called vitamin H) essential for the growth of yeast, 1936, from German Biotin (1936), from Greek biotos "life" (variant of bios, from PIE root *gwei- "to live") + chemical suffix -in (2).

chromatin (n.)

protoplasm in cell nuclei, 1882, from German, coined 1879 by German anatomist Walther Flemming (1843-1905), from Latinized form of Greek khrōmat-, the correct combinational form of khrōma "color" (see chroma) + chemical suffix -in (2). So called because it has a special affinity for coloring matter and stains readily. Related: Chromatid. Compare chromosome.

collin (n.)

pure form of gelatin, 1848, from Greek kolla "glue," which is of uncertain origin, + chemical suffix -in (2).

dentin (n.)

also dentine, the bone-like substance in teeth (as distinguished from enamel or pulp), 1836, from combining form of Latin dens (genitive dentis) "tooth" (from PIE root *dent- "tooth") + chemical suffix -in (2). Related: Dentinal.

dioxin (n.)

1919, from dioxy-, word-forming element in chemistry indicating the presence of two oxygen atoms or two additional oxygen atoms (see di- (1) + oxy-) + chemical suffix -in (2). All the compounds in the group are characterized by two oxygen atoms.