Does the dictionary contain definitions for the plural form of terms?
It is usually best to search using the singular form of a term. However, for some terms there are entries for both the singular and plural forms (for example, kidney/s and ureter/s ). Searching for a plural form of a word will often take you to its singular form (searching for organisms will return a definition for organism). For terms that have irregular plural forms ( bacteria/bacterium and pons/pontes for example) the plural term is included in the dictionary.
