Longman Dictionary of Contemporary English homepage

Topic: HUMAN

Date: 1400-1500
Language: Modern Latin
Origin: Latin, 'curve, fold, hollow place'

sinus

 noun
     
si‧nus [countable]
HBH your sinuses are the spaces in the bones of your head that are connected to the inside of your nose:
blocked sinuses
a sinus infection
Definition of sinus from the Longman Dictionary of Contemporary English within
the topic HUMAN
Word of the Day
The HUMAN
Word of the Day is:
erection

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