• (n.) One of the scales just in front of the eye of a reptile or fish. • (a.) Placed just in front of the eyes, as the antennae of certain insects. Found on http://thinkexist.com/dictionary/meaning/preocular/
<zoology> Placed just in front of the eyes, as the antennae of certain insects. Also one of the scales just in front of the eye of a reptile or fish. ... (05 Mar 1998) ... Found on http://www.encyclo.co.uk/local/20973
Pre·oc'u·lar adjective (Zoology) Placed just in front of the eyes, as the antennæ of certain insects. -- noun One of the scales just in front of the eye of a reptile or fish. Found on http://www.encyclo.co.uk/webster/P/152