| placode | <embryology> Area of thickened ectoderm in the embryo from which a nerve ganglion or a sense organ will develop. (31 Dec 1997) |
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| placoderm | <paleontology> One of the Placodermi. Origin: Gr, tablet + skin. Source: Websters Dictionary (01 Mar 1998) |
| placodermal | <paleontology> Of or pertaining to the placoderms; like the placoderms. Source: Websters Dictionary (01 Mar 1998) |
| placodermata | <paleontology> Same as Placodermi. Source: Websters Dictionary (01 Mar 1998) |
| placodermi | <paleontology> An extinct group of fishes, supposed to be ganoids. The body and head were covered with large bony plates. Origin: NL, fr. Gr, a tablet + skin. Source: Websters Dictionary (01 Mar 1998) |