| acrosome | (noun) a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg | - |
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| autosome | (noun) any chromosome that is not a sex chromosome; appear in pairs in body cells but as single chromosomes in spermatozoa | Synonyms: somatic chromosome |
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| centrosome | (noun) small region of cytoplasm adjacent to the nucleus; contains the centrioles and serves to organize the microtubules | Synonyms: central body |
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| chondriosome | (noun) an organelle containing enzymes responsible for producing energy | Synonyms: mitochondrion |
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| chromosome | (noun) a threadlike strand of DNA in the cell nucleus that carries the genes in a linear order | - |
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| dictyosome | (noun) a netlike structure in the cytoplasm of animal cells (especially in those cells that produce secretions) | Synonyms: Golgi apparatus, Golgi body, Golgi complex |
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| eightsome | (noun) a Scottish reel for eight dancers | - |
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| (noun) eight people considered as a unit | Synonyms: octet, octette |
| episome | (noun) DNA that is not incorporated into the genome but is replicated together with the genome (especially in bacterial cells) | - |
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| fivesome | (noun) five people considered as a unit | Synonyms: quintet, quintette |
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| (noun) the cardinal number that is the sum of four and one | Synonyms: 5, cinque, fin, five, Little Phoebe, pentad, Phoebe, quint, quintet, quintuplet, V |
| foursome | (noun) four people considered as a unit | Synonyms: quartet, quartette |
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| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, IV, Little Joe, quadruplet, quartet, quatern, quaternary, quaternion, quaternity, tetrad |
| liposome | (noun) an artificially made microscopic vesicle into which nucleic acids can be packaged; used in molecular biology as a transducing vector | - |
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| lysosome | (noun) an organelle found in the cytoplasm of most cells (especially in leukocytes and liver and kidney cells) | - |
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| microsome | (noun) a tiny granule in the cytoplasm that is where protein synthesis takes place under the direction of mRNA | - |
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| proteosome | (noun) a form of vaccine that can be administered by an inhaler | Synonyms: proteosome vaccine |
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| ribosome | (noun) an organelle in the cytoplasm of a living cell; they attach to mRNA and move down it one codon at a time and then stop until tRNA brings the required amino acid; when it reaches a stop codon it falls apart and releases the completed protein molecule for use by the cell | - |
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| sarcosome | (noun) a large mitochondrion in a striated muscle fiber | - |
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| schistosome | (noun) flatworms parasitic in the blood vessels of mammals | Synonyms: blood fluke |
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| sevensome | (noun) seven people considered as a unit | Synonyms: septet, septette |
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| sixsome | (noun) six people considered as a unit | Synonyms: sextet, sextette |
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| threesome | (noun) three people considered as a unit | Synonyms: triad, trinity, trio |
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| (noun) the cardinal number that is the sum of one and one and one | Synonyms: 3, deuce-ace, III, leash, tercet, ternary, ternion, terzetto, three, tierce, trey, triad, trine, trinity, trio, triplet, troika |
| twosome | (noun) a pair who associate with one another | Synonyms: couple, duet, duo |
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| (noun) two items of the same kind | Synonyms: brace, couple, couplet, distich, duad, duet, duo, dyad, pair, span, twain, yoke |