132 



GLOSSARY. 



Pericar'dial (Pericar'dium}. Belong- 

 ing to or produced in the pericar- 

 dium. 



Pericardi'tis (Pericar'dium ; itis, 

 denoting inflaination). Inflamma- 

 tion of the pericardium or mem- 

 brane covering the heart. 



Pericar'dium (Gr. irepi, per'i, around; 

 KopSio, bar' dia, the heart). The 

 serous membrane covering the heart. 



Pericarp (Gr. uepi, per'i, around ; 

 Kapiros, karpos, fruit). The seed- 

 vessel, or shell of the fruit of 

 plants. 



Perichon'drium (Gr. irept, per'i, 

 around ; xoi/Spos, chondros, carti- 

 lage). The membrane covering 

 cartilages. 



Pericra'niuin (Gr. irepi, per'i, around ; 

 Kpaviov, kra'nion, the skull). The 

 membrane immediately covering 

 the bones of the skull. 



Per'iderm (Gr. irepi, per'i, about; 

 Sepfj.a, derma, skin). In botany, 

 the outer layer of bark. 



Per'igee (Gr. irepi, per'i, about ; 777, 

 ye, the earth). The point in the 

 moon's path which is nearest to 

 the earth, and where it therefore 

 appears largest. 



Per'igone (Gr. vept, per'i, about ; 

 yovn], gon'e, a pistil). A term for 

 the floral envelopes : sometimes 

 restricted to cases in which the flower 

 bears pistils only. 



Perig'ynous (Gr. irepi, per'i, about ; 

 yvv-r], gune, a female). Growing 

 on some part that surrounds the 

 ovary in a flower ; applied to the 

 corolla and stamens when they are 

 attached to the calyx. 



Perihelion (Gr. irepi, per'i, about ; 

 y\ios, helios, the sun). The point 

 of its orbit in which a planet or 

 comet is nearest to the sun. 



Perim'eter (Gr. irepi, per'i, around ; 

 inerpov, meifron, a measure). The 

 bounds or limits of a body : in a 

 circle, the circumference. 



Pe'riod (Gr. irepi, per'i, about ; <55os, 

 hodos, a way). A circuit : a stated 

 portion of time. 



periodic or Periodical (Gr. irepi, 

 per'i, about ; 65os, hodos, a way). 

 Performed in a regular circuit in a 



given time ; occurring at regular 

 intervals. 



Periodic (Lat. per, very ; i'odine). 

 A term applied to an acid contain- 

 ing an equivalent of iodine and 

 seven of oxygen. 



Periodicity (Period). The disposi- 

 tion of certain things, or circum- 

 stances, to return at stated intervals. 



Periodon'tal (Gr. irepi, per'i, about ; 

 oSovs, odous, a tooth). Surround- 

 ing the teeth. 



Perioe'ci (Gr. irepi, per'i, round a- 

 bout; o\Keu>, oi'keo, I dwell). The 

 inhabitants of the earth who live 

 in the same latitudes, but whose 

 longitudes differ by 180 degrees, so 

 that when ib is noon with one it is 

 midnight with the other. 



Periosti'tis (Perios'teum : itis, denot- 

 ing inflammation). Inflammation of 

 the periosteum. 



Perios'teum (Gr. irepi, per'i, around ; 

 ocneov, os'teon, a bone). The 

 fibrous membrane which invests 

 the bone. 



Perios'tracum (Gr. irepi, per'i, 

 around ; ovrpaKov, os'trakon, a 

 shell). The membrane which covers 

 shells. 



Peripatetic (Gr. irepnra,re<a, peri- 

 pat'eo, I walk about). Walking 

 about : a term applied to the philo- 

 sophy of Aristotle, because taught 

 during walking in the Lyceum at 

 Athens. 



Peripheral (Gr. irepi, pei j i, around ; 

 <epa>, pher'o, I bear). Belonging 

 to the periphery or circumference. 



Periph/ery (Gr. irepi, per'i, around ; 

 <pepo>, pher'o, I bear). The circum- 

 ference. 



Periph'rasis (Gr. irepi, per'i, about ; 

 Qpafa, phrazo, I speak). Circum- 

 locution : the use of more words 

 than are necessary to express an 

 idea. 



Perlplus (Gr. irepi, per'i, around; 

 7r,\eo>, pleo, 1 sail). A sailing 

 round a certain sea or coast. 



Peripneumo'nia. See Pneumo'nia. 



Periscli (Gr.irepi, per'i, around ; OTCZC, 

 skia, a shadow). A name given 

 to the inhabitants of the frigid zones 

 whose shadows move round, and at 



