A crab is any of various crustaceans with four pairs of legs, a pair of pincers, a flattish shell, and a short, broad abdomen folded under its thorax. Several similar animals, such as the crab louse, or the hermit crab[?], are also called crabs.
A crab is any of various machines used to hoist heavy objects.
... two broad groups: athematic[?] and thematic[?]. The thematic verbs are so called because an a, called the theme vowel, is inserted between the stem and the ending. Thi ...