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accumulation something that is accumulated; mass. [1/3 definitions]
adenoid (usu. pl.) a mass of tissue between the nose and the throat that, when swollen, can hinder breathing. [1/2 definitions]
Afro-Eurasia the land mass of Earth that includes all of Africa, Europe, and Asia.
-age aggregate; mass. [1/5 definitions]
agglomerate to gather into a heap or mass. [4 definitions]
agglutination the state of being glued, or the mass or union so formed. [1/2 definitions]
aggregate formed in a dense cluster or mass. [3/6 definitions]
aggregation the act of collecting or being collected into a whole or mass. [2 definitions]
Antarctic the land mass or seas at or near the South Pole; Antarctica or the Antarctic Ocean (prec. by the).
Antarctica the land mass that surrounds the South Pole.
antiparticle in physics, either of two subatomic particles that have the same mass, spin, degree of charge, and magnetic moment, but that have opposite signs of charge and directions of magnetic moment and whose collision causes mutual annihilation.
atmosphere the mass of gases surrounding the earth or any other celestial body. [1/3 definitions]
atmospheric of, pertaining to, or consisting of the mass of gases surrounding the earth. [1/2 definitions]
atomic mass unit a unit equal to one twelfth of the mass of an atom of the most abundant kind of carbon, equal to 1.6605 times 1024 gram.
atomic weight the average weight of one atom of a given element, expressed in atomic mass units.
at. wt. abbreviation of "atomic weight," the average weight of one atom of a given element, expressed in atomic mass units.
bank1 a heap or mass of something, such as earth or clouds. [1/6 definitions]
bar1 a solid mass of a substance often in the shape of an oblong block. [1/13 definitions]
big bang theory the theory that the universe originated at a fixed point billions of years ago in a cosmic explosion of a mass of hydrogen atoms, and that it has been expanding ever since. (Cf. steady state theory.)
billow a surging mass that resembles a wave or swell of water. [1/4 definitions]
blastema an undifferentiated or primitive mass of cells, as in an embryo or regenerating organ, that is capable of becoming organized into a specific tissue or organ.