SDM analyzes phrases entered in the UD and recognizes the keyword in each phrase. These keywords are called Headwords.
SYSTRAN 8 Translator looks at the headwords when it is determining which word in a term should be made plural, a specific gender, or receive other linguistic treatment.
To view the headwords in your dictionary, select Mark Headwords on the View menu. The part of the phrase that has been analyzed as the headword will be in boldface: