| ameloblast | (noun) a cell from which tooth enamel develops | - |
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| aminoplast | (noun) a plastic (synthetic resin) made from amino compounds; used as an adhesive and as a coating for paper and textiles | Synonyms: amino plastic, amino resin |
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| backblast | (noun) backfire from a recoilless weapon | Synonyms: back-blast |
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| ballast | (noun) any heavy material used to stabilize a ship or airship | - |
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| (noun) an electrical device for starting and regulating fluorescent and discharge lamps | Synonyms: light ballast |
| (noun) a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations) | Synonyms: ballast resistor, barretter |
| (noun) an attribute that tends to give stability in character and morals; something that steadies the mind or feelings | - |
| (noun) coarse gravel laid to form a bed for streets and railroads | - |
| blast | (noun) a very long fly ball | - |
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| (noun) intense adverse criticism | Synonyms: attack, fire, flack, flak |
| (noun) an explosion (as of dynamite) | - |
| (noun) a sudden very loud noise | Synonyms: bam, bang, clap, eruption |
| (noun) a highly pleasurable or exciting experience | Synonyms: good time |
| (noun) a strong current of air | Synonyms: blow, gust |
| chloroplast | (noun) plastid containing chlorophyll and other pigments; in plants that carry out photosynthesis | - |
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| chromoplast | (noun) plastid containing pigments other than chlorophyll usually yellow or orange carotenoids | - |
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| clast | (noun) (geology) a constituent fragment of a clastic rock | - |
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| counterblast | (noun) a vigorous and unrestrained response | - |
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| cytoplast | (noun) the intact cytoplasmic content of a cell | - |
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| ectoblast | (noun) the outer germ layer that develops into skin and nervous tissue | Synonyms: ectoderm, exoderm |
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| endoblast | (noun) the inner germ layer that develops into the lining of the digestive and respiratory systems | Synonyms: endoderm, entoblast, entoderm, hypoblast |
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| entoblast | (noun) the inner germ layer that develops into the lining of the digestive and respiratory systems | Synonyms: endoblast, endoderm, entoderm, hypoblast |
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| erythroblast | (noun) a nucleated cell in bone marrow from which red blood cells develop | - |
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| fibroblast | (noun) a cell from which connective tissue develops | - |
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| hypoblast | (noun) the inner germ layer that develops into the lining of the digestive and respiratory systems | Synonyms: endoblast, endoderm, entoblast, entoderm |
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| iconoclast | (noun) someone who attacks cherished ideas or traditional institutions | - |
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| (noun) a destroyer of images used in religious worship | Synonyms: image breaker |
| last | (noun) a person's dying act; the final thing a person can do | - |
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| (noun) holding device shaped like a human foot that is used to fashion or repair shoes | Synonyms: cobbler's last, shoemaker's last |
| (noun) the final stage or concluding parts of an event or occurrence | Synonyms: end |
| (noun) a unit of capacity for grain equal to 80 bushels | - |
| (noun) a unit of weight equal to 4,000 pounds | - |
| (noun) the last or lowest in an ordering or series | - |
| (noun) the temporal end; the concluding time | Synonyms: close, conclusion, finale, finis, finish, stopping point |
| (noun) the time at which life ends; continuing until dead | Synonyms: death |
| lymphoblast | (noun) an immature lymphocyte | - |
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| megaloblast | (noun) abnormally large red blood cell present in pernicious anemia and folic acid deficiency | - |
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| melanoblast | (noun) an epidermal cell that is a precursor of a melanocyte | - |
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| mesoblast | (noun) the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue | Synonyms: mesoderm |
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| monoblast | (noun) a large immature monocyte normally found in bone marrow | - |
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| myeloblast | (noun) a precursor of leukocytes that normally occurs only in bone marrow | - |
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| neuroblast | (noun) a cell from which a nerve cell develops | - |
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| osteoblast | (noun) a cell from which bone develops | Synonyms: bone-forming cell |
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| osteoclast | (noun) cell that functions in the breakdown and resorption of bone tissue | - |
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| phenoplast | (noun) a thermosetting resin | Synonyms: phenolic, phenolic resin |
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| plasmablast | (noun) the precursor of a plasma cell | - |
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| protoplast | (noun) a biological unit consisting of a nucleus and the body of cytoplasm with which it interacts | Synonyms: energid |
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| sandblast | (noun) a blast of wind laden with sand | - |
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| sideroblast | (noun) an erythroblast having granules of ferritin | - |
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| spongioblast | (noun) any of various columnar epithelial cells in the central nervous system that develop into neuroglia | - |
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| trophoblast | (noun) the membrane that forms the wall of the blastocyst in early development; aids implantation in the uterine wall | - |
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