Etymology
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lime (n.1)

"chalky, sticky mineral used in making mortar," from Old English lim "sticky substance, birdlime;" also "mortar, cement, gluten," from Proto-Germanic *leimaz (source also of Old Saxon, Old Norse, Danish lim, Dutch lijm, German Leim "birdlime"), from PIE root *(s)lei- "slime, slimy, sticky" (source also of Latin limus "slime, mud, mire," linere "to smear;" see slime (n.)).

Bird-lime is prepared from the bark of the holly, it was spread on twigs and used for catching small birds. The lime used in building, etc. is made by putting limestone or shells in a red heat, which burns off the carbonic acid and leaves a brittle white solid which dissolves easily in water. Hence lime-kiln (late 13c.), lime-burner (early 14c.). As a verb, c. 1200, from the noun.

lime (n.2)

"greenish-yellow citrus fruit," 1630s, probably via Spanish lima or Portuguese limão, said to be from Arabic lima "citrus fruit," from Persian limun, in reference to the Persian lime, which might be a hybrid of the "Key" lime and the lemon; the word is perhaps from or related to Sanskrit nimbu "lime."

The Key lime indigenous to India and the Malay archipelago (Arabs introduced it to the Levant, North Africa, Spain, and Persia in the Middle Ages); compare Malay (Austronesian) limaw "lime," also, generically, "citrus fruit," which might be the ultimate source. Yule and Burnell think the English got the word from the Portuguese in India. Lime-green as a color is from 1890.

lime (n.3)

"linden tree," 1620s, earlier line (c. 1500), from Middle English lynde (early 14c.), from Old English lind "lime tree" (see linden). Klein suggests the change of -n- to -m- began in compounds whose second element began in a labial (such as line-bark, line-bast). An ornamental European tree, it is unrelated to the tree that produces the citrus fruit.

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Definitions of lime
1
lime (n.)
a caustic substance produced by heating limestone;
Synonyms: calcium hydroxide / slaked lime / hydrated lime / calcium hydrate / caustic lime / lime hydrate
lime (n.)
a white crystalline oxide used in the production of calcium hydroxide;
Synonyms: calcium oxide / quicklime / calx / calcined lime / fluxing lime / unslaked lime / burnt lime
lime (n.)
a sticky adhesive that is smeared on small branches to capture small birds;
Synonyms: birdlime
lime (n.)
any of various related trees bearing limes;
Synonyms: lime tree / Citrus aurantifolia
lime (n.)
any of various deciduous trees of the genus Tilia with heart-shaped leaves and drooping cymose clusters of yellowish often fragrant flowers; several yield valuable timber;
Synonyms: linden / linden tree / basswood / lime tree
lime (n.)
the green acidic fruit of any of various lime trees;
2
lime (v.)
spread birdlime on branches to catch birds;
Synonyms: birdlime
lime (v.)
cover with lime so as to induce growth;
lime the lawn
From wordnet.princeton.edu