The crust and the relatively rigid peridotite below it make up the oceanic lithosphere.

The Heteromitidae tend to be relatively rigid, and produce only temporary pseudopods.

How it manages that growth within the relatively rigid confines of its physical environment is of more than parochial interest.

"The body clock is a relatively rigid function," Dr. Wagner said.

Men, on the other hand, remain relatively rigid after puberty but can still be affected by these factors.

These distinctions were relatively rigid in comparison with those of the past.

As muscles contract, tendons transmit the forces to the relatively rigid bones, pulling on them and causing movement.

Many psychologists had once believed that babies developed on a relatively rigid timetable, dictated by changes in the brain.

The crust and underlying relatively rigid uppermost mantle make up the lithosphere.

The cell wall is the relatively rigid structure surrounding the plant cell.