Definition

Noun: 1. A large family of rodents: Muridae is the scientific name for the largest family of mammals, encompassing typical mice, rats, gerbils, and their relatives. They are characterized by having a single pair of upper and lower incisors that grow continuously, and they typically lack cheek pouches.

Usage Notes

• "Muridae" is a taxonomic term used primarily in scientific and zoological contexts.
• It is always capitalized as it is a proper noun (the name of a biological family).
• It is typically used with a singular verb when referring to the family as a single taxonomic unit.

Examples

• Scientific Classification: "The house mouse () belongs to the family Muridae."
• Zoological Description: "With over 700 species, Muridae is the most diverse family of rodents."
• Comparative Biology: "Researchers studied the dental patterns distinguishing Muridae from other rodent families like Cricetidae."

Advanced Usage

• In Taxonomic Hierarchy: The term is used within the standard biological classification: Order Rodentia > Suborder Myomorpha > Superfamily Muroidea > Family Muridae.
• Adjectival Form (Murid): The adjective "murid" is used to describe characteristics pertaining to this family.
  • Example: "The study focused on murid evolution and biogeography."

Variants and Related Words

• Murid (noun/adjective): A member of the family Muridae; or, relating to that family.
• Muroidea (noun): The superfamily that includes the family Muridae and other related families like Cricetidae (hamsters, voles, lemmings) and Nesomyidae.

Synonyms

• Old World rats and mice family (common descriptive name, though imprecise as the family is now globally distributed).

Notes on Meaning

The definition emphasizes the historical origin ("originally Old World") and a key distinguishing anatomical feature (typically lacking cheek pouches) from the closely related family Cricetidae. While common names like "mouse" or "rat" are used broadly, "Muridae" specifies the exact scientific grouping.

Noun

1. originally Old World rats now distributed worldwide; distinguished from the Cricetidae by typically lacking cheek pouches