- A fleshy clublike spike bearing minute flowers, usually enclosed within a sheathlike spathe, characteristic of aroid plants such as the jack-in-the-pulpit.
- In <em>botany</em>, a form of inflorescence in plants, in which the flowers are closely arranged in a spike or head which has a fleshy or thickened rachis.
- In <em>zoology</em>:
- The hectocotylus of the male cephalopod: a specialized part of the fore foot, on one side, which becomes hectocotylized, or assumes a sexual function. On the opposite side is a corresponding part, not subject to hectocotylization, called the <em>antispadix.</em>
- In <em>Hydrozoa</em>, the manubrium of the hydromedusans, an offset of a blastostyle bearing the genital products, like the part of a pea-pod which bears the peas.
- A genus of cœlenterates.
- A fleshy spike of flowers, usually inclosed in a leaf called a <ex>spathe</ex>.
- A special organ of the nautilus, due to a modification of the posterior tentacles.
- A <xref>fleshy</xref> <xref>spike</xref> (<xref>inflorescence</xref>) with reduced <xref>flowers</xref>, usually enclosed by a <xref>spathe</xref>.
- A special <xref>organ</xref> of the <xref>nautilus</xref>, due to a modification of the <xref>posterior</xref> <xref>tentacles</xref>.
- the fleshy axis of a spike often surrounded by a spathe