Don't suffer every occasional thought to carry you
away into a long parenthesis. --Watts.
2. (Print.) One of the curved lines () which inclose a
parenthetic word or phrase.
Note: Parenthesis, in technical grammar, is that part of a
sentence which is inclosed within the recognized sign;
but many phrases and sentences which are punctuated by
commas are logically parenthetical. In def. 1, the
phrase ``by way of comment or explanation'' is inserted
for explanation, and the sentence would be
grammatically complete without it. The present tendency
is to avoid using the distinctive marks, except when
confusion would arise from a less conspicuous
separation.