Medical Definition of rat louse
: a sucking louse (Polyplax spinulosa) that is a widely distributed parasite of rats and transmits murine typhus from rat to rat
Love words? Need even more definitions?Merriam-Webster unabridged
Words at Play
Ask the Editors
- On Contractions of Multiple Words
- A Look at Uncommon Onomatopoeia
- Is Singular 'They' a Better Choice?