acicular
Shaped like needles
Acicular means needle-shaped—long, slender, and pointed.
The term appears in scientific contexts describing crystals, leaves, or other structures with this form: acicular ice crystals, acicular leaves of the pine.
In mineralogy, acicular crystals are notably thin relative to their length.
Tapering to a tip
- piercingPenetrating or very sharp
- pricklySpiny or irritable
- spinyHaving sharp points
- thornyHaving sharp protrusions
barbed · thorn · spike · quill · spine · bristle · spur · awn
Resembling a thread
- acuminateEnding in sharp point
- bristlyCovered with stiff hairs
- taperedGradually narrowing in width
- capillarySmallest blood vessel
hairlike · wirelike · threadlike · mucronate · linear · attenuate
Light-dispersing, multicolored
- habitSettled regular tendency
- tourmalineBoron silicate gemstone family
- aragoniteCalcium carbonate crystal form
- hornblendeCalcium-iron amphibole mineral
gypsum · crystal · radiating · columnar · fibrous · aggregate
pointed
Tapering to a tip
thorny · barbed · thorn · spike · quill · spine · bristle · spur · awn · stinging
filiform
Resembling a thread
capillary · hairlike · wirelike · threadlike · mucronate · linear · attenuate
prismatic
Light-dispersing, multicolored
- habitSettled regular tendency
- tourmalineBoron silicate gemstone family
- aragoniteCalcium carbonate crystal form
hornblende · gypsum · crystal · radiating · columnar · fibrous · aggregate
pine
Cone-bearing evergreen
evergreen · rosemary · juniper · yew · larch · cedar · cypress · tamarack · hemlock · fascicle
lanceolate
Narrow and tapering
- fusiformCigar-shaped, tapered bilaterally
- stellateRadiating from center
- pinnateHaving paired lateral parts
spatulate · linear · cylindrical · elongate · slender · fine · delicate · tapering · narrow