Genesis 3:18 Thorns also and thistles shall it bring forth to thee; and thou shalt eat the herb of the field; [kjv]
ακανθας και τριβολους ανατελει σοι και φαγη τον χορτον του αγρου [lxx]
The ancient Greek word
"τρίβολος" ≈ "prickly plant" as in a plant with
"thistles" on it. The word appears to literally mean "
three arrows" where ancient Greek often uses the prefix of "
three" to mean "
a lot of". The Latin word
"tribulos" ≈ "thistle".
I have wondered since the 1980's (when I started to learn Greek) if the Star Trek episode involving "
Trouble with tribbles" based the word "
tribble" on the Greek
"τρίβολος" ≈ "prickly plant" for
"thistle" since a tribble in that episode looks somewhat like a
"thistle".
As for a better explanation,
"thistle" have to do!