OPI- 
— 
ae (an 
hie 5 appl. 
eptathodetic (pis hedeet) a. 
» tne behind ; 
entra 
pose 
Pm e be- 
” [Gk. 
opisthe, in detos, bound. 
Lying ema tag to the beak ; afp/ 
in some bivalve shells 
ehi are pes tongue, 
aving the tongue fixed in front, 
free behind (cool). 
opisthognath us (6pis'thognath’t iis) a, 
d; ou The 
jecting tip of the vocab! column 
opponens chee nénz) a. [L. opponere, 
to oppos Pert. muscles which 
cause the “digit s to approach one 
another (ana 
opposite (Sp ‘ézit) a [L. opponere, $e 
oppo hae Pert. "leaves which a 
opposite sides of the aoe cae 
— pope ik) a. [Gk. opsonein, 
er.] Pert. or affected by 
k. ofsonein, 
ood 
lobes, t part of the brain 
V aehich so ce eyes. 
optic thalami,—see thalami. [ 
opticociliary (6p kos a. [Gk 
opsis, sight; L. cilia, e yelashes. ] 
opticop pupillary 
[Gk. opsis, sight; L. pu, upilla, pupil 
e = Per?, optic nerve and pupil 
areca ‘(8p ‘timiim) #. [L. optimus, 
be he most suitable degree 
st. 
of heat, etc. for the full develop- 
ment of the organism conc rned 
biol.) ; the point at which the best 
response can be obtained (phys.). 
217. 
ORD- 
optocoel (dp’tdsél) . [Gk. afsis, 
Sree — hollow.] The os 
the optic lobes of the bra 
ei 
opt: ogram oP’ togram) #. [Gk. ofpszs, 
ot Lraphein, to Migr. = 
mage a pressed on the a by 
the action of light on age visual 
purple (phys. 
ora serrata,—the wavy border of the 
retina, where the nervous elements 
oral (0’ral) a. ‘[L. os, mouth,] Perd. 
or belonging to the Sneath on the 
ich the mouth lies. 
G ZS, 
orb.] A thee a muscles spurs 
— is (Orbtk la s)a. [L, on 
7. a muscle Be eee 
fibre Pies, an opening (amaz.). 
devamate (6rbik’tlat) @. [L. ordis, 
orb.] Nearly ae in outline ; 
appl, leaves (bot. 
orbit (ér’bit) 7. [L. ‘orbita, a are 
The bony cavity in whic 
is sehen paren f the skin round 
ee a the hollow 
bee orbtta, “cir 
VRS: 
y 3 masUus, D 
the orbit pe the nasal portions ‘of 
the adjoining bones (anaz.). 
orbitosphenoid (or bitdsfe'noid) a. 
[L. eae on 
S, 
allied, ranking owes the family 
and the class 
tenes (or’dinat) a. thee ane —— 
Having the markings 
mentation arranged | in rows Goel 
a. [L. ordo, order; punctum, 
a_ prick.] Indicating the serial 
presence of dots, etc. (200. 
Ordovician (ér'dév évish’An) a. it, 
Ordovices, 90 of Wales.] Lower 
Silurian (fad/.). 
