| megasporophyll | A specialised leaf upon (or in the axil of) which one or more megasporangia are borne. (09 Oct 1997) |
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| megasthene | <zoology> One of a group which includes the higher orders of mammals, having a large size as a typical characteristic. Origin: Gr. Megas great + sthenos strength. Source: Websters Dictionary (01 Mar 1998) |
| megasthenic | <zoology> Having a typically large size; belonging to the megasthenes. Source: Websters Dictionary (01 Mar 1998) |
| megastome | <zoology> One of a group of univalve shells, having a large aperture or mouth. Origin: Gr. Megas great + stoma mouth. Source: Websters Dictionary (01 Mar 1998) |
| megateriopeptidase | <enzyme> Amino-endopeptidase Registry number: EC 3.4.99.- (26 Jun 1999) |
| megatherium | <paleontology> An extinct gigantic quaternary mammal, allied to the ant-eaters and sloths. Its remains are found in South America. Origin: NL. Megatherium, fr. Gr. Megas great + thyrion beast. Source: Websters Dictionary (01 Mar 1998) |
| megatheroid | <paleontology> One of a family of extinct edentates found in America. The family includes the megatherium, the megalonyx, etc. Origin: Megatherium. Source: Websters Dictionary (01 Mar 1998) |
| megathrombocyte | A large blood platelet, especially a young one recently released from the bone marrow. Origin: mega-+ G. Thrombos, clot, + kytos, cell (05 Mar 2000) |
| megaureter | An enlarged, dilated ureter. Synonym: megaureter. (05 Mar 2000) |
| megavolt | <physics> One of the larger measures of electromotive force, amounting to one million volts. Origin: Mega- + volt. Source: Websters Dictionary (01 Mar 1998) |
| megavoltage | In radiation therapy, a term for voltage above one million volts. (05 Mar 2000) |
| megawatt | (MW) The electrical unit of power that equals one million Watts (1,000 kW). (05 Dec 1998) |
| megaweber | <physics> A million webers. Origin: Mega- + weber. Source: Websters Dictionary (01 Mar 1998) |