1. 
[syn: inshore, onshore, seaward, shoreward]
2.  on the edge of the land; 
- Example: "an onshore lighthouse"
ADVERB (1)
1.  on or toward the land; 
- Example: "they were living onshore"
The Collaborative International Dictionary of English v.0.48:
onshore \onshore\ adj.
   coming from the sea toward the land; -- of winds and weather;
   as, an onshore gale. Opposed to offshore.
   Syn: inshore, seaward.
        [WordNet 1.5]
   2. On the edge of the land; near the shoreline; as, an
      onshore lighthouse.
      [WordNet 1.5]
WordNet (r) 3.0 (2006):
onshore
    adv 1: on or toward the land; "they were living onshore" [ant:
           offshore]
    adj 1: (of winds) coming from the sea toward the land; "an
           inshore breeze"; "an onshore gale"; "sheltered from
           seaward winds" [syn: inshore, onshore, seaward,
           shoreward] [ant: offshore, seaward]
    2: on the edge of the land; "an onshore lighthouse"