| chiasma | (noun) an intersection or crossing of two tracts in the form of the letter X | Synonyms: chiasm, decussation |
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| chloasma | (noun) a tan discoloration of a woman's face that is associated with pregnancy or with the use of oral contraceptives | Synonyms: mask of pregnancy, melasma |
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| gasman | (noun) someone employed by a gas company | - |
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| gasmask | (noun) a protective mask with a filter; protects the face and lungs against poisonous gases | Synonyms: gas helmet, respirator |
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| melasma | (noun) a tan discoloration of a woman's face that is associated with pregnancy or with the use of oral contraceptives | Synonyms: chloasma, mask of pregnancy |
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| miasma | (noun) unhealthy vapors rising from the ground or other sources | Synonyms: miasm |
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| (noun) an unwholesome atmosphere | Synonyms: miasm |
| mycoplasma | (noun) any of a group of small parasitic bacteria that lack cell walls and can survive without oxygen; can cause pneumonia and urinary tract infection | - |
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| phantasma | (noun) something existing in perception only | Synonyms: apparition, fantasm, phantasm, phantom, shadow |
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| (noun) a ghostly appearing figure | Synonyms: apparition, fantasm, phantasm, phantom, specter, spectre |
| phantasmagoria | (noun) a constantly changing medley of real or imagined images (as in a dream) | - |
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| plasma | (noun) the colorless watery fluid of the blood and lymph that contains no cells, but in which the blood cells (erythrocytes, leukocytes, and thrombocytes) are suspended | Synonyms: blood plasma, plasm |
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| (noun) (physical chemistry) a fourth state of matter distinct from solid or liquid or gas and present in stars and fusion reactors; a gas becomes a plasma when it is heated until the atoms lose all their electrons, leaving a highly electrified collection of nuclei and free electrons | - |
| (noun) a green slightly translucent variety of chalcedony used as a gemstone | - |
| plasmablast | (noun) the precursor of a plasma cell | - |
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| plasmacyte | (noun) a cell that develops from a B lymphocyte in reaction to a specific antigen; found in bone marrow and sometimes in the blood | Synonyms: plasma cell |
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| plasmacytoma | (noun) neoplasm of plasma cells (usually in bone marrow) | - |
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| plasmapheresis | (noun) plasma is separated from whole blood and the rest is returned to the donor | - |
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| xanthelasma | (noun) xanthoma of the eyelids; occurs chiefly in the elderly | - |
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