Fetus
Definition 1 of 2
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Stage Specific
Use 'fetus' for development stages over eight weeks, before that it's called 'embryo'. The fetus is now the size of an orange.
Pro Tip 2/3
Medical Context
'Fetus' is often used by healthcare professionals to communicate about pregnancy. The fetus's heartbeat is strong and healthy.
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Technical Term
'Fetus' is a technical term; 'baby' might be used informally after birth. We saw our baby's fetus during the sonogram.