Definition of "sulcus"
noun:
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A furrow or groove in an organ or a tissue.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
Any of the grooves that mark the convolutions of the surface of the brain.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
Subparallel grooves and ditches formed by geological processes.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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