I pray there exists on-line, an English dictionary that gives me the
origin of words. For example, I have a CONCISE EDITION OF THE
WEBSTER'S NEW WORLD DICTIONARY OF THE AMERICAN LANGUAGE.

The word "isosceles" reads: "adj. [L. Gr. isoskeles  -- isos, equal +
skelos, a leg], designating a triangle with two equal sides.

Another example is "amuse"-- [Fr., a (L. ad), to + OFr.muser, to gaze at].

Thanks in advance to your excellent team of ANSWERS.GOOGLE researchers!!

God bless you to know and do His will!

John

Hola, John!

The most detailed online dictionary of word origins that I know of is
the Online Etymology Dictionary, which has details on the origins of
30,000 English words. I love this site, and use it nearly every day:

Online Etymology Dictionary
http://etymonline.com

Here are the Online Etymology Dictionary's entries on the words
"isosceles" and "amuse":

"isosceles - 1551, from L.L. isosceles, from Gk. isoskeles 'with equal
sides,' from isos 'equal' + skelos 'leg."

Online Etymology Dictionary
http://www.etymonline.com/i4etym.htm 

"amuse - 1480, from M.Fr. amuser 'divert, cause to muse,' from à "at,
to" (but here probably a causal prefix) + muser 'ponder, stare
fixedly.' Sense of 'divert from serious business, tickle the fancy of'
is recorded from 1631, but through 18c. the primary meaning was
'deceive, cheat' by first occupying the attention. Bemuse retains more
of the original meaning. Amusement 'a pastime, play, game, etc.' is
first recorded 1673, originally depreciative. Amusement park is first
recorded 1909. Amusing is noted late 1920s as a vogue word."

Online Etymology Dictionary
http://www.etymonline.com/a4etym.htm

OneLook Dictionary Search is a very useful site which accesses many
online dictionaries (some of which offer word origins). OneLook has a
wildcard search feature (which is great if you aren't sure of the
spelling of a word, or if you want to see variants).

OneLook Dictionary Search
http://onelook.com

Here are some other options:

Google Directory: Reference > Dictionaries > Etymology 
http://directory.google.com/Top/Reference/Dictionaries/Etymology/

I hope this helps! Please let me know if you need anything further.

Best wishes,
pinkfreud

Dear pinkfreud. Hello again!! Thanks so much for another great job!
Now I can get to the "root" of things!! Ha, Ha.

God bless you to know and do His will!

John

www.m-w.com gives etymologies as well...