Meanings

spout of a teapot

small teapot

required subject

indispensable

absolutely necessary

blue whale (Balaenoptera musculus)

essential condition

fin whale

Mount Sumeru (believed to be the centre of the Buddhist world)

gosu porcelain

dais for a Buddhist image

indispensable case

Sue ware (type of unglazed pottery made from the middle of the Kofun era through the Heian era)

absolutely (ought to)

essential amino acid

ridged whale meat used to make whale "bacon"

mandatory attribute

required entry (e.g. in online forms)

single-stringed Japanese zither

Beyrich's slit shell (species of sea snail, Pleurotomaria beyrichii)