English
lagoonal
From lagoon + -al.
Formed from lagoon + -al
Proto-Indo-European *lókus
…
Latin *lacūnus
Latin lacūna ‘a hole, pit, ditch’
Italian laguna
French lagune ‘lagoon, shallow body of coastal water’
English lagoon
Today it means
adj Of or pertaining to a lagoon, especially one behind a coral reef
Language periods are conventional ranges, not dates for this word.
Etymograph / lagoonal