Rad"i*cel (rd"*sl), n. [Dim. of radix.] (Bot.) A small branch of a
root; a rootlet.
Ra*dic`i*flo"rous (r*ds`*fl"rs), a. [L. radix, -icis, root + flos,
floris, a flower.] (Bot.) Rhizanthous.
Ra*dic"i*form (r*ds"*fôm), a. (Bot.) Having the nature or appearance of
a radix or root.
Rad"i*cle (rd"*k'l), n. [L. radicula, dim. of radix, -icis, root: cf.
F. radicule. See Radix.] (Bot.) (a) The rudimentary stem of a plant
which supports the cotyledons in the seed, and from which the root is
developed downward; the stem of the embryo; the caulicle. (b) A
rootlet; a radicel.
Ra*dic"u*lar (r*dk"*lr), a. Of or pertaining to roots, or the root of a
plant.
Rad"i*cule (rd"*kl), n. (Bot.) A radicle.
Ra*dic"u*lose` (r*dk"*ls`), a. (Bot.) Producing numerous radicles, or
rootlets.
Ra"di*i (r"d*), n., pl. of Radius.
Ra"di*o- (r"d*-). A combining form indicating connection with, or
relation to, a radius or ray; specifically (Anat.), with the radius of
the forearm; as, radio-ulnar, radio- muscular, radio-carpal.
||Ra`di*o-flag`el*la"ta (- flj`l*l"t), n. pl. [NL. See Radiate, and
||Flagellata.] (Zoöl.) A group of Protozoa having both flagella and
||pseudopodia.
Ra"di*o*graph (r"d**grf), n. [Radio- + -graph.] (Phys.) A picture
produced by the Röntgen rays upon a sensitive surface, photographic or
fluorescent, especially a picture of opaque objects traversed by the
rays.
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||Ra`di*o*la"ri*a (r`d**l"r*), n. pl. [NL. See Radioli.] (Zoöl.) Order
||of rhizopods, usually having a siliceous skeleton, or shell, and
||sometimes radiating spicules. The pseudopodia project from the body
||like rays. It includes the polycystines. See Polycystina.
Ra`di*o*la"ri*an (r`d**l"r*an), a. (Zoöl.) Of or pertaining to the
Radiolaria. -- n. One of the Radiolaria.
||Ra*di"o*li (r*d"*l), n. pl.; sing. Radiolus (-ls). [NL., dim. of L.
||radius radius: cf. L. radiolus a feeble sunbeam.] (Zoöl.) The barbs
||of the radii of a feather; barbules.
Ra"di*o*lite (r"d**lt), n. [L. radius ray + -lite: cf. F. radiolithe.]
(Paleon.) A hippurite.
Ra`di*om"e*ter (-m"*tr), n. [L. radius radius + -meter: cf. F.
radiomètre.] 1. (Naut.) A forestaff.
2. (Physics) An instrument designed for measuring the mechanical effect
of radiant energy.
It consists of a number of light disks, blackened on one side, placed
at the ends of extended arms, supported on a pivot in an exhausted
glass vessel. When exposed to rays of light or heat, the arms rotate.
Ra`di*o*mi*crom"e*ter (- *m*krm"*tr), n. [Radio- + micrometer.]
(Physics) A very sensitive modification or application of the
thermopile, used for indicating minute changes of radiant heat, or
temperature.
Ra"di*o*phone (r"d**fn), n. [Radio- + Gr. fwnh` sound.] (Physics) An
apparatus for the production of sound by the action of luminous or
thermal rays. It is essentially the same as the photophone.
Ra`di*oph"o*ny (-f"*n), n. (Physics) The art or practice of using the
radiophone.
Ra"di*ous (r"d*s), a. [L. radiosus.] 1. Consisting of rays, as light.
[R.] Berkeley.