Appendix 809 



Ecto- (Gr., outside), ectoderm, the outer layer of cells. 



En- (Gr., in, or within), encyst, to cover with a membranous cyst. 



Endo- or ento- (Gr., within) entoderm, inner layer of cells. 



Eg- (Gr., dawn, or early), eocene, early geologic period. 



Epi- (Gr., upon), epidermis, upon the dermis. 



Equus- (L., horse), Equisetineae, the class to which the horsetails belong. 



Eu- (Gr., good or well), eugenics, being well born from a hereditary standpoint. 



Ex- (Gr., external), exoskeleton, external skeleton. 



Extra- (L., beyond), extracellular, beyond or outside the cell. 



Fer- (L., to bear), Porifera, pore-bearing sponges. 

 Fil- (L., thread), filiform, threadlike. 

 Flex- (L., bend), flexor muscles, bend joints. 

 Form- (L., shape), uniform, all one shape. 



G 



Gam- (Gr., marriage), gamete, a reproductive cell. 



Gastr- (Gr., stomach), gastric, pertaining to the stomach. 



Gen- (Gr., to produce), pathogenic, to produce disease. 



Geo- (Gr., earth), geology, science of the earth. 



Gest- (Gr., to bear or hold), ingest, to take in. 



Glea- (Gr., jelly), mesoglea, the middle jellylike layer in certain animals. 



Glyc- (Gr., sweet or carbohydrate), glycogen, animal starch. 



Gone- (Gr., seed, or to reproduce), gonad, an organ of reproduction. 



Gymn- (Gr., naked), gymnosperm, seeds not covered when being formed. 



H 



Haem- (Gr., blood), haemoglobin, a substance in the blood. 



Hemi- (Gr., half), hemisphere, one-half of a sphere. 



Hepat- (Gr., liver), hepatic, pertaining to the liver. 



Hetero- (Gr., other or different), heterogeneous, formed differently. 



Hex- (Gr., six), hexagonal, six-sided. 



Homo- (Gr., same), homogeneous, similar. 



Hyal- (Gr., glass), hyaline, glasslike cartilage. 



Hydr- (Gr., water), dehydrate, to remov^e water. 



Hymen- (Gr., membrane), hymenoptera, membranous wings. 



Hyper- (Gr., above), hypersensitive, especially sensitive. 



Hypo- (Gr., under), hypoglossal, under the tongue. ' 



In- (L., in, into, not, without), invaginate, to push in. 

 Infra- (L., below), infraorbital, below the orbit. 

 Inter- (L., between), intercellular, between cells. 

 Intr- (L., inside), intracellular, within a cell. 

 Is- (Gr., equal), isotherm, equal temperatures. 



