abnormal number of chromosomes, 1934, from adjective aneuploid (1931), Modern Latin, coined 1922 by G. Täckholm from Greek an- "not, without" (see an- (1)) + euploid, from Greek eu "well, good" (see eu-) + -ploid, from -ploos "fold" (from PIE root *pel- (2) "to fold").

"sound," especially recorded or transmitted sound signals, 1934, abstracted from word-forming element audio- (q.v.), which is from Latin audire "to hear" (from PIE root *au- "to perceive").

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

1934 in publisher's jargon, "books that have been in publication for some time (prior to the current season) and are still in print;" see back (adj.) + list (n.1). As a verb, "to put on the back list," from 1983. Related: Backlisted.

1934, from benzo-, word-forming element used in chemistry to indicate presence of a benzene ring fused with another ring, + di + azo- + epine, a suffix denoting a seven-membered ring, from Greek hepta (see seven).

"short, tight underwear," 1934, from brief (adj.).

generic term for "Nazi, fascist," especially of the thuggish sort, 1934, originally (1922) in reference to the German Sturmabteilung ("Storm Detachment"), the Nazi party militia founded 1921; they were called Brown Shirts in English because of their uniforms.

cereal food, 1934, from Turkish bulghur, bulgar.

Mexican food dish, 1934, from Spanish, literally "little burro" (see burro).

The original recipe in Erna Fergusson's Mexican Cookbook was more like a modern tostada, made from corn cakes with a depression pressed in the center, then filled with chicharrones and baked. The 1898 Diccionario de Mejicanismos describes both this style of burrito as well as the more familiar rolled version (which it considered synonymous with a taco; also see: taquito).

The reason for the name is not given, but it may be that the corn cake burrito is perceived as carrying something on its back, like a burro.

1934, from choline, name of a basic substance abundant in bile (coined in German, 1862, from Greek khole "bile;" see cholera) + Greek ergon "work" (from PIE root *werg- "to do") + -ic.