ADJECTIVE (1)

1. along or following a coast;
- Example: "coastal shipping"
- Example: "coastwise winds contributed to the storm"


ADVERB (1)

1. by way of, or along the coast;
- Example: "we were travelling coastwise"

The Collaborative International Dictionary of English v.0.48:

Coastwise \Coast"wise`\ (-w[imac]z`), Coastways \Coast"ways`\,
   adv.
   By way of, or along, the coast; following a coastline; as,
   coastwise winds contributed to the storm.
   [1913 Webster + WordNet 1.5]

WordNet (r) 3.0 (2006):

coastwise
    adv 1: by way of, or along the coast; "we were travelling
           coastwise"
    adj 1: along or following a coast; "coastal shipping";
           "coastwise winds contributed to the storm"