nounpl: N/A (already plural; singular: focus)
focos
1. Plural of focus; the center of interest or activity; the points at which rays of light or other radiation converge
The foci of the ellipse are located at specific distances from the center.
Os focos da elipse estão localizados a distâncias específicas do centro.
2. Multiple centers of infection or disease in the body
The doctor identified several foci of inflammation in the patient's lungs.
O médico identificou vários focos de inflamação nos pulmões do paciente.
3. Multiple areas of concentration or emphasis
The research project has several foci: education, health, and economic development.
O projeto de pesquisa tem vários focos: educação, saúde e desenvolvimento econômico.
The term 'foci' is primarily used in academic, scientific, and medical contexts in both American English and Brazilian Portuguese. In mathematics classes, it refers to specific points in geometric shapes like ellipses and hyperbolas. In medical contexts, it describes localized areas of disease or infection. The word maintains its Latin plural form in English rather than using 'focuses,' which is the more common English plural in everyday speech.
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