acuto-, acut-, acuti-, acu-, -cusis; also, agu-

(Latin: sharp, to sharpen; point; needle, pin)

acicula (s) (noun), aciculae (pl)
1. A technical name for a slender needle-like body; such as, the spines or prickles with which some animals and plants are furnished, or the needle-like crystals of certain minerals.
2. A needle-shaped part, as of a plant or crystal.
acicular (adjective), more acicular, most acicular
1. Needle-like; resembling a slender needle or bristle, as the leaves of pine-trees, and various crystals.
2. When referring to cast iron: containing ferrite in a needlelike form; or an alloy having a microstructure of needlelike components.
acicular ice (s) (noun), acicular ices (pl)
In hydrology, freshwater ice containing air bubbles and having many long, needlelike crystals and hollow tubes in a layered arrangement.; fibrous ice, satin ice.
aciculate (verb), aciculates; aciculated; aciculating
1. To mark or to striate with scratches or making such an appearance.
2.To shape like a needle.
aciculate (adjective), more aciculate, most aciculate
1. Marked or striated with scratches or having such an appearance.
2. Shaped like a needle.
aciculiform (adjective), more aciculiform, most aciculiform
Needle-shaped: "The aciculiform stem was slender like a needle or a bristle."
aciculilignosa
An evergreen and deciduous needle-leaved vegetation.
aciculine (adjective)
Sharp and pointed like a needle.
aciculite (s), aciculites (pl) (nouns)
In mineralogy, needle ore: "The aciculite is a metallic element that is a silver-white, reddish-tinged, brittle metallic element; such as, lead and copper as seen in acicular or needle-shaped crystals."
aciculum (s), acicula (pl) (nouns)
1. A needle-like spine or bristle, as is present in certain types of worms or flagellates.
2. A projecting cluster of bristles or setae found in certain annelid worms or a fingerlike or handlike bristle seen in certain flagellate protozoa.
3. In zoology, one of the slender, sharp stylets embedded in the parapodia of certain annelid worms, as the polychaetes.
4. A technical name for a slender needle-like body; such as, the spines or prickles with which some animals and plants are furnished, or the needle-like crystals of certain minerals.
acuate
Needle shaped, sharp-pointed.
acuation
Sharpening, rendering acute.
acuclosure
Hemostasis achieved by the placement of needles.
acuition
The act of sharpening.
acuity
1. Acuteness, keeness, as of thought or vision; severity.
2. Special degree of sensitivity.

Cross references of word families that are related directly, or indirectly, to: "sour, sharp": acerb-; aceto-; acid-; acies- (not "sour"); oxy-; pung- (not "sour").