English
halocline
From halo- + -cline.
Proto-Indo-European *ḱley- ‘to incline’
Proto-Indo-European *ḱl̥-né-y-ti ‘to lean’
Proto-Hellenic *klíňňō
Ancient Greek κλῑ́νω ‘to lean, incline’
English cline
Today it means
noun a strong, vertical salinity gradient; the (sometimes indistinct) border between layers of water that contain different amounts of salt
Language periods are conventional ranges, not dates for this word.
Etymograph / halocline