biraphid

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective biraphid is

(in microscopy ) having a raphe an each of both valves; notably said of diatoms.

As a noun diatom

is a group of minute unicellular algae having a siliceous covering of great delicacy, now categorized as class class: Diatomophyceae or division Bacillariophyta, formerly all included in the order order: Diatomaceae, now obsolete.

As an adjective biraphid is

(in microscopy) having a raphe an each of both valves; notably said of diatoms.

As a noun valve

is a device that controls the flow of a gas or fluid through a pipe.

As a verb valve

is to control (flow) by means of a valve.

As an adjective biraphid is

(in microscopy ) having a raphe an each of both valves; notably said of diatoms.

As a noun raphe

is a ridge or seam on an organ, bodily tissue, or other structure, especially at the join between two halves or sections.

As an adjective biraphid is

(in microscopy) having a raphe an each of both valves; notably said of diatoms.