In the region of the head it exhibits on each side a slight bulging outwards, the rudiment of the first visceral cleft.
rudiment -any: the beginning of any structure or part before it has developed.
Behind the mandibles a pair of simple processes has appeared, which forms the rudiment of the first pair of maxill (mx).
A rudiment shows that nature might have given more, but has not done so.
On each side of it a thickening of cells becomes established, regarded by Kowalevsky as the rudiment of the nervous ganglia.
This notch is the only rudiment of the choroid fissure of other types.
The fish form is that in which we have only a rudiment of the cerebrum, which is so large in man.
The anthropoid ape, like man, has only the rudiment of a tail.
Sometimes a rudiment of a fifth toe appears to be traceable.
He wagged his rudiment of a tail, and whimpered in his sleep.
1540s, from Middle French rudiment (16c.) or directly from Latin rudimentum "early training, first experience, beginning, first principle," from rudis "unlearned, untrained" (see rude). Related: Rudiments.
rudiment ru·di·ment (rōō'də-mənt)
An imperfectly or incompletely developed organ or part.
Something in an incipient or undeveloped form. Often used in the plural.