tower mustard

Noun tower mustard has 2 senses

• tower mustard(n = noun.plant) arabis glabra, tower cress, turritis glabra - or genus Arabis: erect cress widely distributed throughout Europe;
is a kind of cress, cress plant
is a member of genus turritis, turritis

• tower mustard(n = noun.plant) arabis turrita, tower cress - European cress having stiff erect stems; sometimes placed in genus Turritis;
is a member of arabis, genus arabis
is a kind of rock cress, rockcress