| ameloblast | (noun) a cell from which tooth enamel develops | - |
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| backblast | (noun) backfire from a recoilless weapon | Synonyms: back-blast |
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| blasphemer | (noun) a person who speaks disrespectfully of sacred things | - |
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| blasphemy | (noun) blasphemous behavior; the act of depriving something of its sacred character | Synonyms: desecration, profanation, sacrilege |
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| (noun) blasphemous language (expressing disrespect for God or for something sacred) | - |
| 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 |
| blastema | (noun) a mass of undifferentiated cells from which an organ or body part develops | - |
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| blaster | (noun) a workman employed to blast with explosives | Synonyms: chargeman |
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| blastocele | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocoel, blastocoele, cleavage cavity, segmentation cavity |
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| blastocoel | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocele, blastocoele, cleavage cavity, segmentation cavity |
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| blastocoele | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocele, blastocoel, cleavage cavity, segmentation cavity |
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| blastocyst | (noun) the blastula of a placental mammal in which some differentiation of cells has occurred | Synonyms: blastodermic vessicle |
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| blastocyte | (noun) an undifferentiated embryonic cell | - |
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| blastocytoma | (noun) a tumor composed of immature undifferentiated cells | Synonyms: blastoma, embryonal carcinosarcoma |
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| blastoderm | (noun) a layer of cells on the inside of the blastula | Synonyms: blastodisc, germinal area, germinal disc |
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| blastodisc | (noun) a layer of cells on the inside of the blastula | Synonyms: blastoderm, germinal area, germinal disc |
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| blastoff | (noun) the launching of a missile or spacecraft to a specified destination | Synonyms: shot |
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| blastogenesis | (noun) theory that inherited characteristics are transmitted by germ plasm | - |
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| (noun) asexual reproduction by budding | - |
| blastoma | (noun) a tumor composed of immature undifferentiated cells | Synonyms: blastocytoma, embryonal carcinosarcoma |
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| blastomere | (noun) any cell resulting from cleavage of a fertilized egg | - |
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| blastomycete | (noun) any of various yeastlike budding fungi of the genus Blastomyces; cause disease in humans and other animals | - |
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| blastomycosis | (noun) any of several infections of the skin or mucous membrane caused by Blastomyces | - |
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| blastopore | (noun) the opening into the archenteron | - |
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| blastosphere | (noun) early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs | Synonyms: blastula |
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| blastula | (noun) early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs | Synonyms: blastosphere |
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| chromoblastomycosis | (noun) a fungal infection characterized by itchy warty nodules on the skin | - |
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| counterblast | (noun) a vigorous and unrestrained response | - |
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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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| erythroblastosis | (noun) a blood disease characterized by the abnormal presence of erythroblasts in the blood | - |
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| fibroblast | (noun) a cell from which connective tissue develops | - |
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| glioblastoma | (noun) a fast-growing malignant brain tumor composed of spongioblasts; nearly always fatal | Synonyms: spongioblastoma |
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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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| 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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| nephroblastoma | (noun) malignant renal tumor of young children characterized by hypertension and blood in the urine and the presence of a palpable mass | Synonyms: adenomyosarcoma, embryoma of the kidney, Wilms' tumor, Wilms tumour |
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| neuroblast | (noun) a cell from which a nerve cell develops | - |
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| neuroblastoma | (noun) malignant tumor containing embryonic nerve cells; usually metastasizes quickly | - |
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| osteoblast | (noun) a cell from which bone develops | Synonyms: bone-forming cell |
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| osteoblastoma | (noun) benign tumor of bone and fibrous tissue; occurs in the vertebrae or femur or tibia or arm bones (especially in young adults) | - |
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| plasmablast | (noun) the precursor of a plasma cell | - |
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| retinoblastoma | (noun) malignant ocular tumor of retinal cells; usually occurs before the third year of life; composed of primitive small round retinal cells | - |
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| sandblast | (noun) a blast of wind laden with sand | - |
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| sandblaster | (noun) a tool that throws out a blast of steam laden with sand; used to clean or grind hard surfaces | - |
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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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| spongioblastoma | (noun) a fast-growing malignant brain tumor composed of spongioblasts; nearly always fatal | Synonyms: glioblastoma |
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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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| vinblastine | (noun) periwinkle plant derivative used as an antineoplastic drug (trade name Velban) that disrupts cell division | Synonyms: Velban |
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