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blastocyst a blastula.
blastoff a launching of a rocket-driven missile or spacecraft.
blastomere any of the first cells produced when a fertilized ovum divides.
blastula an embryo in an early stage of development that consists of a single layer of cells forming a hollow sphere.
blat to give a cry of or like a sheep; bleat. [3 definitions]
blatant completely obvious or undisguised, sometimes offensively so. [2 definitions]
blather meaningless or foolish chatter. [2 definitions]
blatherskite one who is given to meaningless or foolish chatter. [2 definitions]
blaze1 an intense flame or light. [6 definitions]
blaze2 a spot or mark on a tree, often made with paint, that usu. indicates a trail. [4 definitions]
blaze3 to proclaim or advertise.
blazer a sports jacket in a solid, sometimes bright color, often with a school or club emblem on the breast pocket.
blazon to proclaim or display publicly. [4 definitions]
bldg. abbreviation of "building," a relatively large structure used for residences, businesses, or the like.
bleach to make white or lighter in color by using a chemical agent or sunlight. [4 definitions]
bleachable combined form of bleach.
bleacher (usu. pl.) seating arranged in tiers, usu. of benches, as in a gymnasium or the cheaper sections of a baseball park. [2 definitions]
bleachers long, flat seats placed in rows with each row higher than the one before.
bleak1 cold, windswept, or barren. [2 definitions]
bleak2 a small European river fish whose silvery scales are used to make artificial pearls.
blear to blur or partially obscure (eyes or sight). [2 definitions]