banian-dayn.Nautical one on which no meat is served out.
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the world > food and drink > food > meal > meal-time > [noun] > time or day for specific food
flesh-dayc1440
flesh-timea1525
banian-day1748
1748 T. SmollettRoderick Random I. xxv. 234 On Mondays, Wednesdays, and Fridays, the ship's company had no allowance of meat, and..these meagre days were called banyan days.
1823 C. LambChrist's Hosp. in Elia 28 We had three banyan to four meat days in the week.