Lacking an essential element
Or maybe, incomplete is a better word.
The muscular columns (c) attaching the foot to the shell form a ring incomplete in front, external to which is the free mantleskirt.
The Tomsk University remains incomplete, and has only 560 students.
The outer wall of the capsule is incomplete at one pole, leaving an aperture through which the thread is discharged.
Incomplete fusion occurs in sieve tubes.
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