- A sickle-shaped anatomical structure.
- A metal implement, of a form suitable for a pruning-hook, sometimes found among ancient remains.
- In <em>anatomy</em>, something which is falcate or falciform; specifically, a fold of the dura mater separating parts of the brain. See <internalXref urlencoded="falx%20cerebri">falx cerebri</internalXref> and <em>falx cerebelli</em>, below.
- In <em>herpetology</em>, one of the poison-fangs of a serpent: so called from its shape: generally used in the plural.
- In <em>entomology</em>, one of the jointed appendages under the front of a spider's cephalothorax, used to seize and kill its prey.
- In echinoderms, a rotula; one of the mouth-parts of a sea-urchin. See cut under <internalXref urlencoded="Echinoidea">Echinoidea</internalXref>.
- A certain grip or trick in wrestling.
- A curved fold or process of the dura mater or the peritoneum; esp., one of the partitionlike folds of the dura mater which extend into the great fissures of the brain.
- a short <xref>Roman</xref> <xref>sword</xref> that resembles a <xref>sickle</xref>
- A curved fold or process of the <xref>dura mater</xref> or the <xref>peritoneum</xref>, especially one of the <xref>partition</xref>-like <xref>folds</xref> of the dura mater which extend into the great <xref>fissures</xref> of the <xref>brain</xref>.