The only free and comprehensive online etymological dictionary of the Spanish language
radio- Prefix "radiation"

From Latin radius "ray" (see rayo).
radio (1) m. (Noun) "radio"

From radiotelegrafía.
radio (2) m. (Noun) "radius"

18th cent. From Latin radius "ray," but also "wheel spoke" which bridges the distance and position of a geometric radius. See rayo for continued etymology.
radio (3) m. (Noun) "radium"

A modern Latinism from radium "radiation," "ray." See rayo for continued etymology.
radiotelegrafía f. (Noun) "radiography"

From radio- "radiation" and grafia "writing."
raer (Verb) to scrape

12th cent. From Latin radere 'id.' From Proto-Italic *rasd-e/o- 'id.' Of uncertain origin.

Romance: Western Vulgar Latin: Portuguese raer, Galician raer, Occitan rasar, Old French rere, Italian rasare; Eastern Vulgar Latin: Aromanian rad, Romanian rade; Sardinian: rasai

Indo-European: Celtic: Welsh rhathu "to scrape," Breton rahein 'id.'
raíz f. (Noun) root

Early 13th cent. From Latin radicem, accusative of radix 'id.' From Proto-Italic *wrād-ī- 'id.' From Proto-Indo-European *u̯reh2-d-iH- 'id.' From a root *u̯reh2- of unknown meaning.

Romance: Western Vulgar Latin: Portuguese raiz, Galician raíz, Catalan arrel, French racine, Italian radice; Eastern Vulgar Latin: Aromanian arãdãtsinã, Romanian rădăcină; Sardinian: raichina

Indo-European: Celtic: Old Irish frém "root," Welsh gwraidd "roots," Breton gwrizenn 'id.,' Old Cornish grueitan 'id.;' Germanic: Gothic waurts "root," Old Norse rót 'id.,' Old High German wurz "herb," Old Saxon wurt 'id.,' Old Dutch wurt 'id.,' Old English wyrt 'id.' (English wort); Albanian: Tosk rrëzë "root," Gheg rräzë 'id.;' Hellenic: Ancient Greek ῥίζα (rhíza) "root;" Armenian: argat (?) "root;" Indo-Iranian: Old Persian raēša "root;" Tocharian: B witsako (?) "root"
-rama Suffix sight

From Ancient Greek ὅρᾱμᾰ (hórama) "sight," "spectacle," from ὁρᾰ́ειν (horáein) "to see" (Mycenaean o-ro-me-no "watching") and a noun-forming suffix -μᾰ (-ma) (of the same origin as -men). Ancient Greek ὁρᾰ́ειν is from Proto-Indo-European *u̯er- "to notice," "to sense" (of the same origin as vergüenza).
rama (1) f. (Noun) branch

11th cent. From Vulgar Latin *rama 'id.' From Latin ramus 'id.' From a pre-form *rād-mo- 'id.,' from Proto-Italic *wrād-mo- 'id.' From Proto-Indo-European *u̯reh2-d-mo- 'id.,' derived from *u̯reh2-d- "root" (see raíz).
rama (2) f. (Noun) frame

From Middle High German rame 'id.' (Old High German rama). From Proto-Germanic *ramō- 'id.' Origin uncertain.

Germanic: North Germanic: Old Norse ramr; West Germanic: Old Saxon rama, Frisian Roome, Old High German rama