| autotype | 1. A facsimile. 2. A photographic picture produced in sensitized pigmented gelatin by exposure to light under a negative; and subsequent washing out of the soluble parts; a kind of picture in ink from a gelatin plate. Origin: Auto- + -type: cf. F. Autotype. Source: Websters Dictionary (01 Mar 1998) |
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| autotypography | A process resembling "nature printing," by which drawings executed on gelatin are impressed into a soft metal plate, from which the printing is done as from copperplate. Origin: Auto- + typography. Source: Websters Dictionary (01 Mar 1998) |
| autovaccination | A second vaccination with virus from a vaccine sore on the same individual. (05 Mar 2000) |
| autoxidation | The direct combination of a substance with molecular oxygen at ordinary temperatures. Synonym: autoxidation. (05 Mar 2000) |
| autozygous | Denoting genes in a homozygote that are copies of the identical ancestral gene as a result of a consanguineous mating. Origin: auto-+ G. Zygotos, yoked (05 Mar 2000) |
| autumn | 1. The third season of the year, or the season between summer and winter, often called "the fall." Astronomically, it begins in the northern temperate zone at the autumnal equinox, about September 23, and ends at the winter solstice, about December 23; but in popular language, autumn, in America, comprises September, October, and November. In England, according to Johnson, autumn popularly comprises August, September, and October. In the southern hemisphere, the autumn corresponds to our spring. 2. The harvest or fruits of autumn. 3. The time of maturity or decline; latter portion; third stage. "Dr. Preston was now entering into the autumn of the duke's favor." (Fuller) "Life's autumn past, I stand on winter's verge." (Wordsworth) Origin: L. Auctumnus, autumnus, perh. Fr. A root av to satisfy one's self: cf. F. Automne. See Avarice. Source: Websters Dictionary (01 Mar 1998) |
| autumn fever | A fever resembling dengue occurring at the end of the summer in India. Synonym: seven-day fever. Synonym: hasamiyami. (05 Mar 2000) |
| autumnal | 1. Of, belonging to, or peculiar to, autumn; as, an autumnal tint; produced or gathered in autumn; as, autumnal fruits; flowering in autumn; as, an autumnal plant. "Thick as autumnal leaves that strow the brooks In Vallombrosa." (Milton) 2. Past the middle of life; in the third stage. "An autumnal matron." (Hawthorne) Autumnal equinox, the time when the sun crosses the equator, as it proceeds southward, or when it passes the ~ point. ~ point, the point of the equator intersected by the ecliptic, as the sun proceeds southward; the first point of Libra. ~ signs, the signs Libra, Scorpio, and Sagittarius, through which the sun passes between the ~ equinox and winter solstice. Origin: L. Auctumnalis, autumnalis: cf. F. Automnal. Source: Websters Dictionary (01 Mar 1998) |