* (in etymological notes) hypothetical form.
[ ] square brackets enclose the phonetic descriptions, the etymological notes, and explanations by editor inserted in quotations. 

A date in square brackets is sometimes given for the first edition of a book, when that ed. has not been consulted, but when it is known to differ in some respect from the ed. used.

indicates that no evidence for the word in question has been found, beyond that quoted in the article.