xx Glossary
oblong<Loblongus, longish.
obtuse<Lobtusus, blunted (perf. partic. ofob-
tundere, to blunt).
orthogonal<Gkorthogonios, rectangular (or-
thos, right;gonia, angle).
parallel<Gkparallelos, beside one another
(para, beside;allelous, one
another).
perimeter<Gkperimetron, circumference (peri
around;metron, measure).
perpendicular<Lperpendiculum,
plumb-line (perpendere, to weigh precise-
ly).
plane<Lplanum, level ground (planus,
level).
point<L punctum, small hole (pungere,to
pierce).
polygon <Gkpolygonon, thing with
many angles (polys,many;gonia, angle).
positive <Lpositivus, settled (ponere, to place).
postulate<Lpostulare,toaskfor.
power<OFpoeir<Lposse,tobeable.
product<Lproductus, brought forth (perf. par-
tic. ofproducere,tobring
forth).
proportion<Lportio, comparative
relationship (pro, according to;
portio,part).
quadrangle<Lquadrangulum, thing
with four angles (quattuor, four;angulus,
angle).
quotient<Lquotiens, how often.
radius<Lradius, rod, spoke of wheel.
rectangle<Lrectiangulum, right-
angled (rectus, right;angulus, angle).
rhombus<Gkrhombos, a device
whirled round (rhembein, to whirl round).
science<Lscientia, knowledge (scire, to know).
secant<Lsecans(gen.secantis), cutting (se-
care,tocut).
square<OFesquarre<Lquattuor,
four.
subtract<Lsubtractus, withdrawn
(perf. partic. ofsubtrahere, to withdraw).
sum<Lsumma, top.
tangent<Ltangens(sc.linea) (gen.
tangentis), touching line (tangere,to
touch;linea,line).
technical< Gk tekhnikos, artistic, skilful
(tekhne, art).
theorem<Gktheorema, thing observed, de-
duced principle (theorein, to observe).
total<Ltotus, whole, all.
trapezium<Gktrapezion,smalltable
(trapeza,table).
triangle<Ltriangulum, triangle (tris,
three;angulus, angle).
trigonometry<Gktrigonometria,
measurement of triangles (trigonon,trian-
gle;metrein, to measure).
vector<Lvector, bearer (vehere,to
bear).
vertex<Lvertex, summit.
volume<OFvolum<Lvolumen, roll, book
(volvere,toroll).