Meanings

large ditch

clearance groove

Solenogastres (subclass of small worm-like molluscs)

lateral sulcus (brain structure)

sulcus

nasolabial sulcus

Mariana Trench (deepest part of the ocean, near the Mariana Islands)

Chinese lobelia (Lobelia chinensis)

epidermal depression

Chinese pond mussel (Sinanodonta woodiana)

subterranean drain

gutter oil

fluting

keyway

mammary slit (in whales, dolphins and porpoises)

ligature mark

snow drainage gutter

record groove