| angiosperm | (noun) plants having seeds in a closed ovary | Synonyms: flowering plant |
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| berm | (noun) a narrow edge of land (usually unpaved) along the side of a road | Synonyms: shoulder |
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| (noun) a narrow ledge or shelf typically at the top or bottom of a slope | - |
| blastoderm | (noun) a layer of cells on the inside of the blastula | Synonyms: blastodisc, germinal area, germinal disc |
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| chordamesoderm | (noun) the area of mesoderm that forms the notochord | Synonyms: chordomesoderm |
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| chordomesoderm | (noun) the area of mesoderm that forms the notochord | Synonyms: chordamesoderm |
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| echinoderm | (noun) marine invertebrates with tube feet and five-part radially symmetrical bodies | - |
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| ectoderm | (noun) the outer germ layer that develops into skin and nervous tissue | Synonyms: ectoblast, exoderm |
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| ectotherm | (noun) an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals | Synonyms: poikilotherm |
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| endoderm | (noun) the inner germ layer that develops into the lining of the digestive and respiratory systems | Synonyms: endoblast, entoblast, entoderm, hypoblast |
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| endosperm | (noun) nutritive tissue surrounding the embryo within seeds of flowering plants | - |
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| entoderm | (noun) the inner germ layer that develops into the lining of the digestive and respiratory systems | Synonyms: endoblast, endoderm, entoblast, hypoblast |
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| episperm | (noun) protective outer layer of seeds of flowering plants | Synonyms: seed coat, testa |
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| exoderm | (noun) the outer germ layer that develops into skin and nervous tissue | Synonyms: ectoblast, ectoderm |
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| exotherm | (noun) a compound that gives off heat during its formation and absorbs heat during its decomposition | - |
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| germ | (noun) a minute life form (especially a disease-causing bacterium); the term is not in technical use | Synonyms: bug, microbe |
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| (noun) a small apparently simple structure (as a fertilized egg) from which new tissue can develop into a complete organism | - |
| (noun) anything that provides inspiration for later work | Synonyms: seed, source |
| gymnosperm | (noun) plants of the class Gymnospermae having seeds not enclosed in an ovary | - |
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| herm | (noun) a statue consisting of a squared stone pillar with a carved head (usually a bearded Hermes) on top; used in ancient Greece as a boundary marker or signpost | - |
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| homeotherm | (noun) an animal that has a body temperature that is relatively constant and independent of the environmental temperature | Synonyms: homoiotherm, homotherm |
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| homoiotherm | (noun) an animal that has a body temperature that is relatively constant and independent of the environmental temperature | Synonyms: homeotherm, homotherm |
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| homotherm | (noun) an animal that has a body temperature that is relatively constant and independent of the environmental temperature | Synonyms: homeotherm, homoiotherm |
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| isogeotherm | (noun) an isogram connecting points of equal temperature below the surface of the earth. | - |
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| isotherm | (noun) (meteorology) an isogram connecting points having the same temperature at a given time | - |
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| mesoderm | (noun) the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue | Synonyms: mesoblast |
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| midterm | (noun) an examination administered in the middle of an academic term | Synonyms: midterm exam, midterm examination |
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| (noun) middle of an academic term or a political term in office | - |
| (noun) the middle of the gestation period | - |
| ostracoderm | (noun) extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic | - |
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| pachyderm | (noun) any of various nonruminant hoofed mammals having very thick skin: elephant, rhinoceros, hippopotamus | - |
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| perisperm | (noun) the nutritive tissue outside the sac containing the embryo in some seeds | - |
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| perm | (noun) a series of waves in the hair made by applying heat and chemicals | Synonyms: permanent, permanent wave |
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| (verb) give a permanent wave to | - |
| placoderm | (noun) fish-like vertebrate with bony plates on head and upper body; dominant in seas and rivers during the Devonian; considered the earliest vertebrate with jaws | - |
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| poikilotherm | (noun) an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals | Synonyms: ectotherm |
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| progymnosperm | (noun) an ancestral fossil type from which modern gymnosperms are thought to have derived | - |
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| pteridosperm | (noun) an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae) | Synonyms: seed fern |
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| sperm | (noun) the male reproductive cell; the male gamete | Synonyms: sperm cell, spermatozoan, spermatozoon |
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| term | (noun) (architecture) a statue or a human bust or an animal carved out of the top of a square pillar; originally used as a boundary marker in ancient Rome | Synonyms: terminal figure, terminus |
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| (noun) any distinct quantity contained in a polynomial | - |
| (noun) a word or expression used for some particular thing | - |
| (noun) one of the substantive phrases in a logical proposition | - |
| (noun) (usually plural) a statement of what is required as part of an agreement | Synonyms: condition, strings |
| (noun) a limited period of time | - |
| (noun) the end of gestation or point at which birth is imminent | Synonyms: full term |
| (verb) name formally or designate with a term | - |
| therm | (noun) a unit of heat equal to 100,000 British thermal units | - |
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