If whales evolved from land-dwelling mammals, one would expect the fossil record to include intermediate forms, creatures more whale-like than land-dwelling mammals yet still possessing hind limbs and a pelvis lacking in modern whales. such intermediates are termed forms
vestigial features
hybrids
homologous structures

transitional forms

Explanation:

the form of organism  that exhibit the shape which is intermediate between the  their ancestors and the   descendants  (just like a father between grandfather and grandson) is known to be the transitional form of respective organism.

The transitional form organisms or fossils have some traits and similarities which are common to both ancestors and the   descendants.

liquid crystals are matters in a state which have properties between those of conventional liquids and those of solid crystals[1]. liquid crystal is partially ordered and anisotropic. in terms of molecular order, liquid crystal molecules have one-dimensional or two-dimensional long - range order.