| amphibian |
any cold-blooded vertebrate, such as a frog or salamander, that has aquatic gill-breathing larvae and terrestrial lung-breathing adults. [4 definitions] |
| amphibious |
able to live both on land and in water. [3 definitions] |
| amphibole |
any of a number of hydrous silicate minerals, such as hornblende, that mostly comprise various combinations of magnesium, calcium, sodium, iron, and aluminum. |
| amphioxus |
a tiny fishlike marine organism characterized by a primitive vertebra and dorsal nerve tissue; lancelet. |
| amphiprostyle |
having a row of columns at each end but none along the sides, as an ancient Greek temple. |
| amphitheater |
an arena or stadium consisting of tiers of seats rising outward from an open central area, used for performances, contests, and the like. [2 definitions] |
| amphitheatre |
a spelling of "amphitheater" used in Canada and Britain. See "amphitheater" for more information. |
| amphora |
a tall oval ceramic vessel with a narrow neck and two handles, used in ancient Greece and Rome for storage or decoration. |
| amphoteric |
in chemistry, able to function as both an acid and a base. |
| amphotericin |
a medication used to treat fungal infections, esp. those that are systemic. |
| ampicillin |
a synthetic antibiotic related to penicillin, taken orally to fight a variety of bacterial infections. |
| ample |
sufficient or more than sufficient in size, capacity, or amount. |
| amplexicaul |
encircling or clasping the stem, as some leaves. |
| amplification |
the process or result of making larger or greater. [4 definitions] |
| amplifier |
a person or thing that enlarges, expands, or amplifies. [2 definitions] |
| amplify |
to make larger or greater. [4 definitions] |
| amplitude |
the state or quality of being ample; largeness. [3 definitions] |
| amplitude modulation |
see "AM." |
| amply |
in an ample way; abundantly; fully. |
| ampoule |
a small, sealable glass or plastic bulb used for sterile storage of material, esp. for subsequent analysis or hypodermic injection. |
| ampulla |
a round bottle with two handles, used by the ancient Romans for wine, oil, or perfume. [2 definitions] |