| acid rock |
a form of music popular in the late 1960s and early 1970s that has loud, often distorted sounds and harmonies, and lyrics that suggest psychedelic experiences. |
| Adar |
the sixth month of the Jewish lunisolar calendar, occurring from late February through early March in the Gregorian calendar. |
| advanced |
well beyond an early stage of development, or considerably beyond the level of others. [1/3 definitions] |
| AIDS-related complex |
a condition characterized by enlargement of the lymph nodes that may be an early sign of AIDS. |
| apocalypse |
any of several early Jewish or Christian writings on divine revelation that symbolically depict the ultimate conflict between good and evil. [1/3 definitions] |
| Archean |
of, relating to, or designating the earlier of two geological periods of the Precambrian Era, ending approximately 2.5 billion years ago, during which highly crystalline igneous and metamorphic rocks were formed; Early Precambrian; Archeozoic; azoic. [1/2 definitions] |
| archiblast |
the outer layer of an embryo in a very early, two-layered stage of development. [1/2 definitions] |
| art nouveau |
(sometimes cap.) a style of art in the late nineteenth and early twentieth centuries, notable for motifs taken from nature and expressed with curved lines. |
| atrium |
an enclosed courtyard, esp. in ancient Roman houses or early Christian churches. [1/2 definitions] |
| autism |
a developmental disorder usually becoming detectable in very early childhood that is characterized especially by atypical acquisition or use of language as well as atypical patterns of social interaction. |
| Av |
the eleventh month of the Jewish lunisolar calendar, occurring from late July through early August in the Gregorian calendar. |
| Babbitt |
the title character and protagonist of Sinclair Lewis's early twentieth-century novel, who is smug, conventional, and resolutely middle-class. [1/2 definitions] |
| betimes |
before the time that is necessary, expected, or customary; early. |
| biplane |
an early type of airplane with two sets of wings mounted one above the other. |
| Black Lives Matter |
an early twenty-first century social and political movement that seeks to raise awareness of and put an end to unjust treatment of Black people, esp. that which occurs in the form of police brutality. |
| blastula |
an embryo in an early stage of development that consists of a single layer of cells forming a hollow sphere. |
| blunderbuss |
an early shoulder-gun having a short barrel, flared at the muzzle to scattershot at close range. [1/2 definitions] |
| bowery |
a Dutch settler's farm or country residence in early New York. [1/2 definitions] |
| Caspar Milquetoast |
a timid, easily dominated character in the early twentieth-century comic strip The Timid Soul by H. T. Webster. [1/2 definitions] |
| catacomb |
(cap.; pl.) such a burial ground near Rome, used by the early Christians (prec. by "the"). [1/2 definitions] |
| chondrite |
a stony meteorite that contains chondrules, formed from materials present in the early solar system . |