e/Olfactory pit

Information
has gloss	eng: By the upgrowth of the surrounding parts the olfactory areas are converted into pits, the olfactory pits, which indent the fronto-nasal process and divide it into a medial and two lateral nasal processes.
lexicalization	eng: Olfactory pit
instance of	(noun) the branch of biology that studies the formation and early development of living organisms embryology