Crossword clues for pinna
The Collaborative International Dictionary
Pinna \Pin"na\, n.; pl. Pinn[ae], E. Pinnas. [L., a feather.]
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(Bot.)
A leaflet of a pinnate leaf. See Illust. of Bipinnate leaf, under Bipinnate.
One of the primary divisions of a decompound leaf.
(Zo["o]l.) One of the divisions of a pinnate part or organ.
[L. pinna, akin to Gr. ?.] (Zo["o]l.) Any species of Pinna, a genus of large bivalve mollusks found in all warm seas. The byssus consists of a large number of long, silky fibers, which have been used in manufacturing woven fabrics, as a curiosity.
(Anat.) The auricle of the ear. See Ear.
Byssus \Bys"sus\, n.; pl. E. Byssuses; L. Byssi.[L. byssus fine flax, fine linen or cotton, Gr. by`ssos .]
A cloth of exceedingly fine texture, used by the ancients. It is disputed whether it was of cotton, linen, or silk.
(Zo["o]l.) A tuft of long, tough filaments which are formed in a groove of the foot, and issue from between the valves of certain bivalve mollusks, as the Pinna and Mytilus, by which they attach themselves to rocks, etc.
(Bot.) An obsolete name for certain fungi composed of slender threads.
Asbestus.
Wiktionary
n. 1 (context anatomy English) The visible part of the ear that resides outside of the head, the auricle. 2 (context botany English) A leaflet or primary segment of a pinnate compound leaf. 3 (context zoology English) A feather, wing, fin, or other similar appendage.
WordNet
Wikipedia
Pinna is a genus of bivalve molluscs belonging to the family Pinnidae. The type species of the genus is Pinna rudis.
The most completely studied species in the genus is P. nobilis, a Mediterranean pen shell which was historically important as the principal source of sea silk.
Usage examples of "pinna".
The Epacris and the Boronia pinnata and Boronia serrulata, and also Star-hair made a pink carpet.
The pinnae move forwards and at the same time sink downwards, whilst the main petiole rises considerably.
A pinna was cemented with shellac on the summit of a little stick driven firmly into the ground, immediately beneath a pair of leaflets, to the midribs of both of which excessively fine glass filaments were attached.
When he slid his thumb back and forth across the smooth leather, he felt not what was there but what might soon be available for his caress: delicately shaped ridges of cartilage forming the auricula and pinna, the graceful curves of the channels that focused sound waves inward toward the tympanic membrane.
The petiole of a leaf was fixed to a cork support, close to the point whence the four pinnae diverge, with a short fine filament cemented longitudinally to one of the two terminal pinnae, and a graduated semicircle was placed close beneath it.
The leaflets move towards the apex of the pinna and become imbricated, and the pinnae then look like bits of dangling string.
The pinnae themselves move downwards, and at the same time backwards or towards the stem of the plant.
The four pinnae also approach each other closely, and the whole leaf is thus rendered very compact.
It consists of a long petiole bearing only two pinnae (here represented as rather more divergent than is usual), each with two pairs of leaflets.
The pinnae also approach each other closely, so that the four terminal leaflets come together.
The hinder pairs of pinnae likewise sink downwards, but do not converge, that is, move towards the apex of the leaf.
But the pinnae at the same time sink greatly, and sometimes hang almost perpendicularly downwards.
The pinnae approach one another, but remain in the same plane as during the day.
Now in these three latter cases, though the pinnae do not mutually protect one another at night, yet after having sunk down they expose, as does a dependent sleeping leaf, much less surface to the zenith and to radiation than if they had remained horizontal.
With this latter plant, moreover, the pinnae converge in the evening by a steady movement, whereas during the day they are continually converging and diverging to a slight extent.