ˈsā noun
also sei whale
( -s )
Etymology: sei, short for sei whale; sei whale, part translation of Norwegian seihval, from sei coalfish (akin to Old Norse seidhr coalfish) + hval whale; from its habit of following the coalfish in search of food — more at saithe
: a common and widely distributed small white-spotted rorqual ( Balaenopterus borealis )