| ASTHENOSPHERES | • asthenospheres n. Plural of asthenosphere. • ASTHENOSPHERE n. the upper layer of the earth's mantle, below the lithosphere, characterized by a relatively low resistance to plastic flow. |
| CHEMOSYNTHESES | • chemosyntheses n. Plural of chemosynthesis. • CHEMOSYNTHESIS n. synthesis of organic compounds (as in living cells) by energy derived from inorganic chemical reactions. |
| CHEMOTHERAPIES | • chemotherapies n. Plural of chemotherapy. • CHEMOTHERAPY n. therapy involving the use of chemicals. |
| HELIOTHERAPIES | • heliotherapies n. Plural of heliotherapy. • HELIOTHERAPY n. medical treatment by exposure to the sun's rays. |
| HENDECAHEDRONS | • HENDECAHEDRON n. a solid figure having 11 plane faces. |
| HERESIOGRAPHER | • heresiographer n. One who writes about heresies. • HERESIOGRAPHER n. a person who writes about heresies. |
| HETEROCHRONIES | • heterochronies n. Plural of heterochrony. • HETEROCHRONY n. divergence from normal time sequence in development, also HETEROCHRONISM. |
| HETEROGRAPHIES | • heterographies n. Plural of heterography. • HETEROGRAPHY n. incorrect spelling. |
| HETEROMORPHIES | • heteromorphies n. Plural of heteromorphy. • HETEROMORPHY n. dissimilarity in shape, structure, or magnitude. |
| HETEROPHYLLIES | • HETEROPHYLLY n. the state of being heterophyllous. |
| HETEROTHALLIES | • HETEROTHALLY n. the state of being heterothallic, also HETEROTHALLISM. |
| HETEROTROPHIES | • heterotrophies n. Plural of heterotrophy. • HETEROTROPHY n. the state of being a heterotroph, a secondary feeder eating plants or other animals. |
| HOMESCREETCHES | • HOMESCREETCH n. the mistle thrush. |
| TRICHOTHECENES | • trichothecenes n. Plural of trichothecene. • TRICHOTHECENE n. any of several mycotoxins produced by various fungi. |