Function: noun
Date: circa 1934
: a word (as the noun book ), hyphenated or open compound (as the verb book-match or the noun book review ), word element (as the affix pro- ), abbreviation (as agt ), verbalized symbol (as Na ), or term (as man in the street ) entered alphabetically in a dictionary for the purpose of definition or identification or expressly included as an inflected form (as the noun mice or the verb saw ) or as a derived form (as the noun godlessness or the adverb globally ) or related phrase (as one for the book ) run on at its base word and usually set in a type (as boldface) readily distinguishable from that of the lightface running text which defines, explains, or identifies the entry