Having the form or shape of a fossa or ditch; resembling a pit, groove, or depression.
From Latin fossus (dug, past participle of fodere) plus -form (from forma 'shape'), meaning 'having the form of a fossa.'
Anatomists describe brain structures as fossiform when they dip inward like ditches—your brain is literally a landscape of fossiform valleys that guide its folds and functions!
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